bluuebunny/crossref_metadata_2025_split huggingface dataset:
Bibliometric analysis of Asian ‘language and linguistics’ research: A case of 13 countries
Authors: Lee Danielle 
Published: July 2023

AbstractThe foci of voluminous bibliometric studies on ‘language and linguistics’ research are limited to specific sub-topics with little regional context. Given the paucity of relevant literature, we are relatively uninformed about the regional trends of ‘language and linguistics’ research. This paper aims to analyze research developments in the field of ‘language and linguistics’ in 13 Asian countries: China, Hong Kong, India, Indonesia, Iran, Israel, Japan, Malaysia, Saudi Arabia, Singapore, South Korea, Taiwan, and Turkey. This study probed 30,515 articles published between 2000 and 2021, assessing each within four major bibliometric perspectives: (1) productivity, (2) authorship and collaborations, (3) top keywords, and (4) research impact. The results show that, in Asian ‘language and linguistics’ research, the relative contributions made by the 13 countries comprised 85% of the total number of articles produced in Asia. The other 28 Asian countries’ output, for the past two decades, never surpassed that of the individual 13 countries. Among the 13 countries, the most prolific were China, Japan, Hong Kong, and Taiwan; they especially published most articles in international core journals. In contrast, Indonesia, Iran, and Malaysia published more in regional journals. Traditionally, research on each country’s national language(s) and dialects were chiefly conducted throughout a period of 22 years. In addition, coping with internationalization worldwide, from 2010 onward, topics related to ‘English’ were of burgeoning interest among Asian researchers. Asian countries often collaborated with each other, and they also exerted a high degree of research influence on each other. The present study was designed to contribute to the literature on the comprehensive bibliometric analyses of Asian ‘language and linguistics’ research.
Active stabilization of kilogauss magnetic fields to the ppm level for magnetoassociation on ultranarrow Feshbach resonances
Authors: Borkowski Mateusz , Reichsöllner Lukas , Thekkeppatt Premjith , Barbé Vincent , van Roon Tijs , van Druten Klaasjan , Schreck Florian 
Published: July 2023

Feshbach association of ultracold molecules using narrow resonances requires exquisite control of the applied magnetic field. Here, we present a magnetic field control system to deliver magnetic fields of over 1000 G with ppm-level precision integrated into an ultracold-atom experimental setup. We combine a battery-powered, current-stabilized power supply with active feedback stabilization of the magnetic field using fluxgate magnetic field sensors. As a real-world test, we perform microwave spectroscopy of ultracold Rb atoms and demonstrate an upper limit on our magnetic field stability of 2.4(3) mG at 1050 G [2.3(3) ppm relative] as determined from the spectral feature.
A novel hydrothermal route of preparing CuMnO2 nanoflakes and their application in Li-ion batteries and supercapacitors
Authors: Cheng Cuixia 
Published: July 2023

CuMnO2 nanoflakes have been prepared utilizing a hydrothermal technique with nitrilotriacetic acid as a precipitant. The structure, composition, and morphology are characterized by several techniques. Interestingly, the as-prepared sample delivers 993 mAh g−1 after 300 cycles, excellent rate capabilities (523.2, 293.3, and 156.1 mAh g−1 at 0.5, 1.0, and 2.0 A g−1, respectively) as the anode of a Li-half battery, and a high specific capacitance of 403.3 F g−1 even at 12 A g−1, as well as stable cycling, excellent kinetics, and rate capabilities for supercapacitors applications, which are superior to the single Cu2O or Mn2O3, suggesting a great potential for advanced lithium-ion batteries.
Evaluation of the 5-ethynyl-1,3,3-trimethyl-3H-indole ligand for molecular materials applications
Authors: Jago David , Milan David C. , Sobolev Alexandre N. , Higgins Simon J. , Vezzoli Andrea , Nichols Richard J. , Koutsantonis George A. 
Published: July 2023

The modification of conjugated organic compounds with organometallic moieties allows the modulation of the electronic and optoelectronic properties of such compounds and lends them to a variety of material applications. The organometallic complexes [M(Cp′)(L)n] (M = Ru or Fe; Cp′ = cyclopentadiene (Cp) or pentamethylcyclopentadiene (Cp*); (L)n = (PPh3)2 or 1,2-bi(diphenylphosphino)ethane (dppe)) and [M(L)n] (M = Ru; (L)n = (dppe)2 or (P(OEt)3)4; or M = Pt; (L)n = (PEt3)2, (PPh3)2 or tricyclohexylphosphine, (PCy3)2) modified with a 5-ethynyl-1,3,3-trimethyl-3H-indole ligand were prepared and characterised by NMR spectroscopy, IR and single-crystal X-ray diffraction. Cyclic voltammetry and IR spectroelectrochemistry of the ruthenium systems showed a single-electron oxidation localised over the M–C≡C–aryl moiety. The N-heteroatom of the indole ligand showed Lewis base properties and was able to extract a proton from a vinylidene intermediate as well as coordinate to CuI. Examples from the wire-like compounds were also studied by single-molecule break junction experiments but molecular junction formation was not observed. This is most likely attributable to the binding characteristics of the substituted terminal indole groups used here to the gold contacts.
EURAMET DOSEtrace supplementary comparison in terms of the ambient dose equivalent/rate for photon radiation (EURAMET.RI(I)-S18)
Authors: Živanović Miloš , Hupe Oliver , Zutz Hayo , Šabeta Amra , Sandtner Stanislav , Kržanović Nikola 
Published: July 2023

Main text
A supplementary comparison in terms of the ambient dose equivalent/rate was organized within EURAMET as a part of the DOSEtrace project, between 13 national metrology institutes and designated institutes. Calibration coefficients were compared for a secondary standard ionisation chamber for 3 X-ray and 2 γ-ray radiation qualities used in the field of radiation protection. Radiation qualities were established according to ISO 4037-1. Measurements were performed between 2019 and 2021.
For the purpose of this comparison, it was considered that the reported uncertainty was confirmed if the relative deviation from the comparison reference value was smaller than or equal to the associated uncertainty. All the reported results by all the partners satisfied this criterium. Three participants were not able to perform calibrations in all mandatory radiation qualities, due to technical problems. The results are published in the Key Comparison Data Base (KCDB) of the BIPM as supplementary comparison EURAMET.RI(I)-S18.
To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/.
The final report has been peer-reviewed and approved for publication by the CCRI, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
Study of correspondence principle in 1-dimension through examples
Authors: Paul Susobhan , Bhattacharyya Satadal , Mitra Joydip 
Published: July 2023

Abstract
We present several examples both for non-perturbative and perturbative systems to illustrate Bohr’s correspondence principle which is not usually treated in common text-books. In particular, the importance of the limit n → ∞ and h → 0 in understanding of the classical limit of quantum theory has been discussed explicitly in each case.
Enhanced performance of perovskite solar cell by using wavy pattern microstructure antireflective foil as a front surface
Authors: Ma Nanxi , Lu Feiping , Tang Fei , Ling Weijun , Yang Jinfang 
Published: July 2023

Abstract
Perovskite solar cells (PSCs) have been considered promising photovoltaic technology, given their potential to achieve high power conversion efficiency (PCE) and simple preparation technology. Improving the efficiency of PSCs has always been one of the hot issues concerned by researchers since the first PSCs were reported. In this paper, the PSCs with the structure of glass/ITO/poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine]/perovskite/C60/atomic layer deposition device SnO
x
/Ag were carefully designed and prepared, and two kinds of polydimethylsiloxane (PDMS) film were scheduled and used in front surfaces of the prepared PSCs as the antireflective foil, which effectively improved the performance of PSCs. Compared with the control device, the short-circuit current density (J
SC) and PCE for the PSCs with flat or wavy pattern microstructure PDMS antireflective foil as front surfaces can be improved simultaneously, reaching 22.67 mA cm−2 and 20.57%, increased by 8.5% and 8.8%, respectively. The improvement of device performance can be ascribed to the advancement of light absorption and reduction of light reflectance by using the wavy pattern microstructure PDMS antireflective foil at the front surface. Lastly, the working mechanism of wavy pattern microstructure PDMS antireflective foil was discussed. This work can provide a facile way to improve the performance of PSCs.
Evaluation of predictive correlation between flux expulsion and grain growth for superconducting radio frequency cavities
Authors: Sung Zu Hawn , Kulyavtsev Paulina , Martinello Martina , Gonnella Dan , Ross Marc , Posen Sam 
Published: July 2023

Abstract
A series of experiments were carried out in an effort to develop a simple method for predicting the magnetic flux expulsion behavior of high purity niobium used to fabricate superconducting radio frequency (SRF) cavities. Using conventional metallographic characterizations in conjunction with high spatial resolution electron backscattered diffraction-orientation imaging microscopy, we find that the flux expulsion behavior of 1.3 GHz single cell SRF Nb cavities is significantly associated with the grain growth of the Nb material during heat treatment. Most of the Nb grains rapidly grew during 900 °C heat treatment, and were likely full-recrystallized with 1000 °C HT. When compared to the magnetic flux expulsion ratio (B
sc/B
nc) at ΔT = 5 K, the flux expulsion efficiency of the cavities increases with the increase of grain size. Most interestingly, 900 °C HT shows a roughly linear trend that suggests that this criterion could be used to predict the appropriate heat treatment temperature for sufficient flux expulsion behavior in SRF-grade Nb. This result can be used to see if flux expulsion can be predicted by examining the materials coming from Nb vendors, prior to cavity fabrication.
Thermodynamics of exponential Kolmogorov–Nagumo averages
Authors: Morales Pablo A , Korbel Jan , Rosas Fernando E 
Published: July 2023

AbstractThis paper investigates generalized thermodynamic relationships in physical systems where relevant macroscopic variables are determined by the exponential Kolmogorov–Nagumo average. We show that while the thermodynamic entropy of such systems is naturally described by Rényi’s entropy with parameterγ, an ordinary Boltzmann distribution still describes their statistics under equilibrium thermodynamics. Our results show that systems described by exponential Kolmogorov–Nagumo averages can be interpreted as systems originally in thermal equilibrium with a heat reservoir with inverse temperatureβthat are suddenly quenched to another heat reservoir with inverse temperatureβ′=(1−γ)β. Furthermore, we show the connection with multifractal thermodynamics. For the non-equilibrium case, we show that the dynamics of systems described by exponential Kolmogorov–Nagumo averages still observe a second law of thermodynamics and the H-theorem. We further discuss the applications of stochastic thermodynamics in those systems—namely, the validity of fluctuation theorems—and the connection with thermodynamic length.
Research on Calibration Method of off-axis Closed-loop Detection System for Multi-target Spectral Telescope
Authors: Du Congcong , Wang Yingfu , Duan Shipeng , Liang Jiadong , Cai Zeyu , Liu Zhigang , Hu Hongzhuan , Wang Jianping , Chu Jiaru , Cui Xiangqun , Zhang Yong , Zhang Haotong , Zhou Zengxiang 
Published: July 2023

Abstract
The LAMOST telescope has been operating steadily for more than 10 yr and is currently undergoing an upgrade to its fiber-optic positioning system on the telescope’s focal plane. By adding a vision detection system to accurately measure the current position of the optical fibres and carry out closed-loop feedback control, the positioning accuracy of the original optical fiber system is greatly improved. Due to the limitation of the existing optical path of the telescope, to avoid blocking the optical path, the detection system camera cannot be placed on the optical axis of the telescope, which makes the camera and the optical fiber end face at a relatively inclined position. However, the angle between the camera and an object will introduce errors to the polynomial calibration method used in the visual detection system. To address this problem, by analyzing the relationship between the camera imaging principle and the polynomial calibration method, this paper studies the influence of distortion and imaging angle on polynomial calibration results under different angle conditions and proposes an improved high-precision polynomial calibration method. First, the distortion parameters are calculated using Zhang’s method, and the image distortion is removed. Then, a mapping model between oblique plane image and nonoblique plane image is established through a homography matrix. The coordinates of all oblique plane feature points are mapped one by one to the nonoblique plane positions on the image space, and a good correction effect is obtained. Finally, the calibration images from different angles are calculated and analyzed through simulation experiments and compared with Zhang’s method. The results show that this method has a 10%–40% improvement over Zhang’s method.
Schrödinger and Klein–Gordon theories of black holes from the quantization of the Oppenheimer and Snyder gravitational collapse
Authors: Corda Christian 
Published: July 2023

Abstract
The Schrödinger equation of the Schwarzschild black hole (BH) has been recently derived by the author and collaborators. The BH is composed of a particle, the ‘electron’, interacting with a central field, the ‘nucleus’. Via de Broglie’s hypothesis, one interprets the ‘electron’ in terms of BH horizon’s modes. Quantum gravity effects modify the BH semi-classical structure at the Schwarzschild scale rather than at the Planck scale. The analogy between this BH Schrödinger equation and the Schrödinger equation of the s states of the hydrogen atom permits us to solve the same equation. The quantum gravitational quantities analogous of the fine structure constant and of the Rydberg constant are not constants, but the dynamical quantities have well-defined discrete spectra. The spectrum of the ‘gravitational fine structure constant’ is the set of non-zero natural numbers. Therefore, BHs are well-defined quantum gravitational systems obeying Schrödinger’s theory: the ‘gravitational hydrogen atoms’. By identifying the potential energy in the BH Schrödinger equation as being the gravitational energy of a spherically symmetric shell, a different nature of the quantum BH seems to surface. BHs are self-interacting, highly excited, spherically symmetric, massive quantum shells generated by matter condensing on the apparent horizon, concretely realizing the membrane paradigm. The quantum BH described as a ‘gravitational hydrogen atom’ is a fictitious mathematical representation of the real, quantum BH, a quantum massive shell having a radius equal to the oscillating gravitational radius. Nontrivial consequences emerge from this result: (i) BHs have neither horizons nor singularities; (ii) there is neither information loss in BH evaporation, nor BH complementarity, nor firewall paradox. These results are consistent with previous ones by Hawking, Vaz, Mitra and others. Finally, the special relativistic corrections to the BH Schrödinger equation give the BH Klein–Gordon equation and the corresponding eigenvalues.
A Linear Operator Method to Compute the Normal Modes with Rotation of any Asymmetric 3D Planet with Pure Vector Spherical Harmonics
Authors: Zhang Mian , Huang Cheng-Li 
Published: July 2023

Abstract
In order to compute the free core nutation of the terrestrial planets, such as Earth and Mars, the Moon and lower degree normal modes of the Jovian planets, we propose a linear operator method (LOM). Generalized surface spherical harmonics (GSSHs) are usually applied to the elliptical models with a stress tensor, which cannot be expressed in vector spherical harmonics explicitly. However, GSSHs involve complicated math. LOM is an alternative to GSSHs, whereas it only deals with the coupling fields of the same azimuthal order m, as is the case when a planet model is axially symmetric and rotates about that symmetry axis. We extend LOM to any asymmetric 3D model. The lower degree spheroidal modes of the Earth are computed to validate our method, and the results agree very well with what is observed. We also compute the normal modes of a two-layer Saturn model as a simple application.
Modified Masses and Parallaxes of Close Binary Systems: HD 39438
Authors: Masda Suhail , Yousef Z. T. , Al-Wardat Mashhoor , Al-Khasawneh Awni 
Published: July 2023

Abstract
We present the detailed fundamental stellar parameters of the close visual binary system HD 39438 for the first time. We used Al-Wardat’s method for analyzing binary and multiple stellar systems. The method implements Kurucz’s plane parallel model atmospheres to construct synthetic spectral energy distributions (SEDs) for both components of the system. It then combines the results of the spectroscopic analysis with the photometric analysis and compares them with the observed ones to construct the best synthetic SED for the combined system. The analysis gives the precise fundamental parameters of the individual components of the system. Based on the positions of the components of HD 39438 on the H-R diagram, and evolutionary and isochrone tracks, we found that the system belongs to the main sequence stars with masses of 1.24 and 0.98 solar masses for the components A and B, respectively, and age of 1.995 Gyr for both components. The main result of HD 39438 is new dynamical parallax, which is estimated to be 16.689 ± 0.03 mas.
A Spectral Element Method to Compute Earth’s Free Core Nutation
Authors: Zhang Mian , Huang Cheng-Li 
Published: July 2023

Abstract
The Free Core Nutation (FCN) is a rotational mode caused by non-alignment of the rotation axis of the core and of the mantle. Its period observed by VLBI and superconducting gravimetry is around 430 sidereal days (Sd) with precision of better than 1 Sd, while its “theoretical” period calculated by traditional approaches and a given Earth model ranges from 450 to 470 Sd. Their gap of about 30 Sd is significant compared with its observation precision. We propose a spectral element method to compute the period of FCN and obtain a period of 434 Sd which is very close to the observed value.
A Pulsar Wind Nebula Origin of the Ultra-high-energy Source 1LHAASO J1929+1846
Authors: Xia Qi , Zhou Lian-Cheng , Fang Jun 
Published: July 2023

Abstract
1LHAASO J1929+1846 is one of the ultra-high-energy (UHE, E > 0.1 PeV) sources in the first catalog of γ-ray sources detected by the Large High Altitude Air Shower Observatory. It has been detected fluxes at 3 TeV for 2.48 ± 0.11 × 10−13 TeV−1 cm−2 s−1 with the Water Cherenkov Detector Array and at 50 TeV for 0.64 ± 0.06 × 10−16 TeV−1 cm−2 s−1 with the Kilometer Squared Array, but the origin of its UHE emission remains unknown. The pulsar wind nebula (PWN) G54.1+0.3, which is powered by the pulsar PSR 1930+1852 with a period of 136 ms and it is detected within a 0.°29 region around the centroid of 1LHAASO J1929+1846. We explore whether G54.1+0.3 is capable of producing the UHE radiation of 1LHAASO J1929+1846. First, the data with Fermi Large Area Telescope for the PWN is analyzed to obtain the GeV fluxes. Second, the multiband non-thermal fluxes for the nebula are investigated based on a one-zone time-dependent model. In the model, we assume the spin-down energy of the pulsar is persistently injected into particles (electrons and positrons) and magnetic field in the PWN, and these high-energy particles produce multiband non-thermal radiation from radio to γ-rays via synchrotron radiation and inverse Compton scattering. We reproduce the spectral energy distribution of PWN G54.1+0.3 with reasonable parameters. The result indicates that the UHE γ-ray source 1LHAASO J1929+1846 possibly originates from PWN G54.1+0.3.
Assessment of the Seismic Vulnerability of a Multi-storey RC Structure with Plan Irregularity: A Case Study
Authors: Arif W , Craifaleanu I G 
Published: July 2023

Abstract
A nine-story reinforced concrete dual system (wall-frame) building located in Bucharest, categorized as plan-asymmetric and designed according to the provisions of Romanian and European codes was studied. The criteria for regularity in plan were verified comparatively according to three codes (Eurocode 8, ASCE 7-16 and the Romanian seismic design code P100-1-2013). The seismic behaviour of the studied building was further investigated by detailed nonlinear static analyses (pushover) and nonlinear dynamic analyses performed on the 3-D building model, for various load patterns and spectrum-compatible ground motion records, respectively. The seismic vulnerability of the building was estimated based on the structural vulnerability index, determined from the nonlinear analyses. The study highlighted the significant effects of the overall torsion on the investigated parameters, in particular on interstory drifts and roof displacements, but also on the seismic vulnerability index.
Roadmap on spatiotemporal light fields
Authors: Shen Yijie , Zhan Qiwen , Wright Logan G , Christodoulides Demetrios N , Wise Frank W , Willner Alan E , Zou Kai-heng , Zhao Zhe , Porras Miguel A , Chong Andy , Wan Chenhao , Bliokh Konstantin Y , Liao Chen-Ting , Hernández-García Carlos , Murnane Margaret , Yessenov Murat , Abouraddy Ayman F , Wong Liang Jie , Go Michael , Kumar Suraj , Guo Cheng , Fan Shanhui , Papasimakis Nikitas , Zheludev Nikolay I , Chen Lu , Zhu Wenqi , Agrawal Amit , Mounaix Mickael , Fontaine Nicolas K , Carpenter Joel , Jolly Spencer W , Dorrer Christophe , Alonso Benjamín , Lopez-Quintas Ignacio , López-Ripa Miguel , Sola Íñigo J , Huang Junyi , Zhang Hongliang , Ruan Zhichao , Dorrah Ahmed H , Capasso Federico , Forbes Andrew 
Published: July 2023

Abstract
Spatiotemporal sculpturing of light pulse with ultimately sophisticated structures represents a major goal of the everlasting pursue of ultra-fast information transmission and processing as well as ultra-intense energy concentration and extraction. It also holds the key to unlock new extraordinary fundamental physical effects. Traditionally, spatiotemporal light pulses are always treated as spatiotemporally separable wave packet as solution of the Maxwell’s equations. In the past decade, however, more generalized forms of spatiotemporally nonseparable solution started to emerge with growing importance for their striking physical effects. This roadmap intends to highlight the recent advances in the creation and control of increasingly complex spatiotemporally sculptured pulses, from spatiotemporally separable to complex nonseparable states, with diverse geometric and topological structures, presenting a bird’s eye viewpoint on the zoology of spatiotemporal light fields and the outlook of future trends and open challenges.