bluuebunny/crossref_metadata_2025_split huggingface dataset:
Modification of BCZT piezoelectric ceramics by modulating oxygen vacancies in different sintering atmospheres
Authors: Liu Chang , Mao Runyu , Wu Qiyun , Li Jianlin , Zheng Deyi , Fei Zihao , Pang Chi 
Published: June 2023

In this work, we regulated the oxygen vacancy concentration by sintering BCZT + 0.1 mol % Y + 0.1 mol % Nb [BCZT-0.1 mol % (Y + Nb)] ceramics under air, oxygen, argon, and vacuum atmospheres and examined the effect of oxygen vacancy concentration on phase composition, crystal structure, microstructure, and electrical properties. X-ray photoelectron spectrometry and X-ray diffraction Rietveld refinement showed that the air- and oxygen-sintered ceramic samples had lower oxygen vacancy concentrations, and the oxygen octahedral lattice distortion in the samples was stable when the R-O-T phases coexisted, forming a multiphase coexistence structure with more spontaneous polarization directions. The oxygen-sintering atmosphere is important in oxygen compensation, which promotes the formation of dense microstructure, thereby increasing the Curie temperature (TC). Oxygen vacancy formation energy was low in the argon and vacuum atmospheres, and some oxygen vacancies increased the mass transfer effect and grain growth. Nevertheless, excess oxygen vacancies increased the leakage current during polarization resulting in poor polarity, which prevents directional deflection of domains and degrades performance. The vacuum-sintered sample was calcined in 1000 °C air for oxygen supplementation sintering, and as the sintering time increased, the oxygen vacancy concentration decreased, the grains grew further, the density increased, and the piezoelectric properties improved. The oxygen-sintered BCZT-0.1 mol % (Y + Nb) samples had good comprehensive electrical properties (d33 = 547 pC/N, kp = 55%, εr = 5355, Pr = 10.63 µC/cm2, EC = 1.89 kV/cm, tan δ = 0.02, and TC = 102 °C).
Showing where you stand
Authors: Vandenitte Sébastien 
Published: June 2023

Abstract
Enactment is a frequent depictive strategy used to denote referents. Its referential functions are increasingly
well-documented cross-linguistically, notably in sign languages. A lesser-known function of enactment is that of stance
expression. By enacting a referent, language users can also convey their own perspective and comment on the enacted individual. In
this article, it is argued that the depictive manipulation of the French Belgian Sign Language (LSFB) lexical sign ls,
which refers to the action of signing, is a fruitful area of investigation for the study of social meanings conveyed by means of
enactment. The observation of elicited dyadic conversations about language attitudes shows that LSFB signers can mold several
formational aspects of the sign ls in a variety of ways by means of enactment, providing a near first-hand experience
of – and commenting on – diverse signers and their signing styles.
Put another way
Authors: Meurant Laurence 
Published: June 2023

Abstract
Reformulation involves saying something again in a different way. Because of its metalinguistic nature (Rabatel 2017), combined with its general aim of clarifying the utterance, we propose to
consider the act of reformulation as offering a window to the way interlocutors process and adjust themselves and their utterances
in their social language practices. More specifically, this study proposes a set of four analytical criteria to characterize
interlocutors’ investment in discourse and interaction via the observation of their use of reformulations. These criteria concern
the frequency of reformulations within a production, the proportion of self- and other-reformulations (Güllich and Kotschi 1987), the type of adjustment that the act of reformulation seeks to achieve
(Authier-Revuz 1995) and the type of semiotic strategies used, namely descriptive, indicative and depictive ways of meaning making
(Clark 1996; Ferrara and Hodge 2018).
The paper draws on the exploratory analysis of the productions of deaf LSFB signers extracted from the LSFB Corpus. It illustrates
how describing the reformulations according to the proposed criteria, reveals distinctions between different patterns of
pragmatic attitude and involvement in discourse and interaction. This approach opens new avenues for the pragmatic descriptions of
LSFB and signed discourses in general.
Foreign accent in L1 (first language)
Authors: Han Jeong-Im , Kim Joo-Yeon , Tsukada Kimiko 
Published: June 2023

Abstract
This study builds on Flege et al. (2006) and evaluated the influence of
chronological age and length of residence in North America on degree of foreign accent in first language (L1) Korean by Korean
adults and children in immigrant settings. The adult (A4/6) and child (C4/6) immigrants lived in the host countries for 4 or 6
years, respectively. Their Korean utterances were compared to those of age-matched controls in Seoul, Korea. The purpose was to
examine the cross-linguistic influence of English on the degree of foreign accent in L1 Korean by the immigrants. Eighteen
native-speaking judges rated four Korean utterances for overall degree of perceived foreign accent. Both adult and child
immigrants were more strongly foreign accented than the controls. However, (1) stability of L1 Korean was greater (less
foreign-accented) for the adult than child immigrants; and (2) there was no significant difference between the A4 and A6, and C4
and C6 groups. This suggests that by the time the Korean immigrants lived in North America for four years, they have diverged
audibly from the predominantly monolingual speakers in Seoul. The results have implications for L1 maintenance/attrition and
plasticity in spoken language processing.
Further observations on the definition of global hyperbolicity under low regularity
Authors: Minguzzi E 
Published: June 2023

Abstract
The definitions of global hyperbolicity for closed cone structures and topological preordered spaces are known to coincide. In this work we clarify the connection with definitions of global hyperbolicity proposed in recent literature on Lorentzian length spaces and Lorentzian optimal transport, suggesting possible corrections for the terminology adopted in these works. It is found that in Kunzinger–Sämann’s Lorentzian length spaces the definition of global hyperbolicity coincides with that valid for closed cone structures and, more generally, for topological preordered spaces: the causal relation is a closed order and the causally convex hull operation preserves compactness. In particular, it is independent of the metric, chronological relation or Lorentzian distance.
Black hole minimum size and scalar charge in shift-symmetric theories
Authors: Thaalba Farid , Antoniou Georgios , Sotiriou Thomas P 
Published: June 2023

Abstract
It is known that, for shift-symmetric scalars, only a linear coupling with the Gauss–Bonnet (GB) invariant can introduce black hole hair. Such hairy black holes have a minimum mass, determined by the coupling of this interaction, and a scalar charge that is uniquely determined by their mass and spin for a fixed value of that coupling. Here we explore how additional shift-symmetric interactions affect the structure of the black hole, the value of the minimum mass, and the scalar charge.
Optical solitons in curved spacetime
Authors: Spengler Felix , Belenchia Alessio , Rätzel Dennis , Braun Daniel 
Published: June 2023

Abstract
Light propagation in curved spacetime is at the basis of some of the most stringent tests of Einstein’s general relativity. At the same time, light propagation in media is at the basis of several communication systems. Given the ubiquity of the gravitational field, and the exquisite level of sensitivity of optical measurements, the time is ripe for investigations combining these two aspects and studying light propagation in media located in curved spacetime. In this work, we focus on the effect of a weak gravitational field on the propagation of optical solitons in non-linear optical media. We derive a non-linear Schrödinger equation describing the propagation of an optical pulse in an effective, gradient-index medium in flat spacetime, encoding both the material properties and curved spacetime effects. In analyzing the special case of propagation in a 1D optical fiber, we also include the effect of mechanical deformations and show it to be the dominant effect for a fiber oriented in the radial direction in Schwarzschild spacetime.
Noncommutative Hamiltonian formalism for noncommutative gravity
*
Authors: Castellani Leonardo 
Published: June 2023

Abstract
We present a covariant canonical formalism for noncommutative (NC) gravity, and in general for NC geometric theories defined via a twisted

⋆

-wedge product between forms. Noether theorems are generalized to the NC setting, and gauge generators are constructed in a twisted phase space with

⋆

-deformed Poisson bracket. This formalism is applied to NC d = 4 vierbein gravity, and allows to find the canonical generators of the tangent space

⋆

-gauge group.
Strategies to reduce the thermoelastic loss of multimaterial coated finite substrates
Authors: Zhou R , Molina-Ruiz M , Hellman F 
Published: June 2023

Abstract
Thermoelastic loss is an important energy dissipation mechanisms in resonant systems. A careful analysis of the thermoelastic loss is critical to the design of low-noise devices for high-precision applications, such as the mirrors used for gravitational-wave (GW) detectors. In this paper, we present analytical solutions to the thermoelastic loss due to thermoelasticity between different materials that are in contact. We find expressions for the thermoelastic loss of multimaterial coatings of finite substrates, and analyze its dependencies on material properties, mirror design and operating experimental conditions. Our results show that lower operating mirror temperature, thinner layers and higher number of interfaces in the coating, and the choice of the first layer of the coating that minimizes the thermal expansion mismatch with the substrate are strategies that reduce the thermoelastic loss and, therefore, diminish the thermal noise that limits the resolution in sensing applications. The results presented in this paper are relevant for the development of low-noise GW detectors and for other experiments sensitive to energy dissipation mechanisms when different materials are in contact.
Advanced materials for triboelectric nanogenerator
Authors: Li Chang-Heng , Ma Xinyu , Fu Jingjing , Sun Yuexuan , Wang Feipeng , Huang Zhengyong , Li Jian 
Published: June 2023

Abstract
Due to the advantages of excellent output power, low cost and easily preparation, triboelectric nanogenerator (TENG) is developing rapidly in the field of renewable energy. The output performance of TENG is largely dependent on the surface charge density, which is closely related to the ability of the tribo-material to gain or lose electrons. To obtain higher output power, numerous efforts have been done on material modifications of the friction layer and electrodes of TENG with additional fillers or molecular modifications. In this review, advanced materials for the preparation of TENG devices to achieve high output, humidity-resisting and wear-resisting performance are presented and the working mechanisms of performance optimisation are discussed. Moreover, natural materials, recyclable materials and non-conventional electrode materials are mentioned to inspire subsequent research on TENG.
Magnetization reversal modes and coercive field dependence on perpendicular magnetic anisotropy in FePt thin films
Authors: Román A , Lopez Pedroso A , Bouzehouane K , Gómez J E , Butera A , Aguirre M H , Soares M Medeiros , Garcia C , Steren L B 
Published: June 2023

Abstract
The competition between shape and perpendicular magnetic anisotropies in magnetic thin films gives rise to unusual magnetic behaviors. In ferromagnetic thin films, the presence of an out-of-plane component of the magnetic anisotropy may induce a transition from planar to stripe-like magnetic domains above a critical thickness,

t

c

. In this article, we present a detailed study of the magnetization switching mechanism in FePt thin films, where this phenomenon is observed. Using micromagnetic simulations and experiments, we found that below

t

c

the reversal mechanism is well described by the two-phase model while above this thickness the magnetization within each stripe reverses by coherent rotation. We also analyzed the out-of-plane component of the magnetic anisotropy and its temperature dependence, probing that substrate-induced strains are responsible for the abnormal coercive field behavior observed for FePt films with

t
>

t

c

.
Characterization of crack on the outer edge of the disk based on blade tip timing technology
Authors: Zhang Fanyu , Guo Shuaiping , Li Xuejun , Han Qingkai , Ma Jiaojiao , Zhang Hongxian 
Published: June 2023

Abstract
The structural performance failure of the rotating blade disk with disk crack is one of the major causes of aero-engine failures and even serious accidents. The blade tip timing (BTT) is a non-contact measurement technology that obtains the rotor operation status by detecting the blade. This paper has proposed a crack characterization method for the disk’s outer edge based on the BTT technique. In this process, the influence of crack state parameters (length and position) on the circumferential displacement signal of the blade tip is determined by using the crack tip displacement, the relative position of the blade tip motion during the rotation of the outer edge crack-containing disk and the actual blade tip measuring points, and the critical value of the crack state parameters affecting the blade tip offset is analyzed. The finite element simulation results verify the effectiveness and accuracy of the proposed method. The study of this article can provide a theoretical basis for the measurement of cracks on the disk’s outer edge by the BTT technique, which is of great significance for the accurate identification of the operating condition of the rotating blade disk structure.
Continuum limit for the Ablowitz–Ladik system
Authors: Killip Rowan , Ouyang Zhimeng , Visan Monica , Wu Lei 
Published: June 2023

Abstract
We show that solutions to the Ablowitz–Ladik system converge to solutions of the cubic nonlinear Schrödinger equation for merely L
2 initial data. Furthermore, we consider initial data for this lattice model that excites Fourier modes near both critical points of the discrete dispersion relation and demonstrate convergence to a decoupled system of nonlinear Schrödinger equations.
A simple experiment to study the array theorem using Fraunhofer diffraction of a two-dimensional grating
Authors: Singh Mamraj 
Published: June 2023

Abstract
A transmission electron microscopy (TEM) grid comprises an array of identical square apertures. In this study, the Fraunhofer diffraction pattern of a TEM grid was obtained by a 532 nm wavelength diode laser. It was compared with the Fraunhofer diffraction pattern computed by using the array theorem and employed to estimate the mesh size of the TEM grid.
Magnetohydrodynamics simulation of magnetic flux rope formation in a quadrupolar magnetic field configuration
Authors: Kumar Sanjay , Prasad Avijeet , Nayak Sushree S , Agarwal Satyam , Bhattacharyya R 
Published: June 2023

Abstract
Magnetic flux ropes (MFRs) play an important role in high-energetic events like solar flares and coronal mass ejections in the solar atmosphere. Importantly, solar observations suggest an association of some flaring events with quadrupolar magnetic configurations. However, the formation and subsequent evolution of MFRs in such magnetic configurations still need to be fully understood. In this paper, we present idealized magnetohydrodynamics (MHD) simulations of MFR formation in a quadrupolar magnetic configuration. A suitable initial magnetic field having a quadrupolar configuration is constructed by modifying a three-dimensional linear force-free magnetic field. The initial magnetic field contains neutral lines, which consist of X-type null points. The simulated dynamics initially demonstrate the oppositely directed magnetic field lines located across the polarity inversion lines (PILs) moving towards each other, resulting in magnetic reconnections. Due to these reconnections, four highly twisted MFRs form over the PILs. With time, the foot points of the MFRs move towards the X-type neutral lines and reconnect, generating complex magnetic structures around the neutral lines, thus making the MFR topology more complex in the quadrupolar configuration than those formed in bipolar loop systems. Further evolution reveals the non-uniform rise of the MFRs. Importantly, the simulations indicate that the pre-existing X-type null points in magnetic configurations can be crucial to the evolution of the MFRs and may lead to the observed brightenings during the onset of some flaring events in the quadrupolar configurations.
Three-dimensional structure and stability of discontinuities between unmagnetized pair plasma and magnetized electron-proton plasma
Authors: Dieckmann M E , Folini D , Falk M , Bock A , Steneteg P , Walder R 
Published: June 2023

Abstract
We study with a 3D particle-in-cell simulation discontinuities between an electron–positron pair plasma and magnetized electrons and protons. A pair plasma is injected at one simulation boundary with a speed 0.6c along its normal. It expands into an electron-proton plasma and a magnetic field that points orthogonally to the injection direction. Diamagnetic currents expel the magnetic field from within the pair plasma and pile it up in front of it. It pushes electrons, which induces an electric field pulse ahead of the magnetic one. This initial electromagnetic pulse (EMP) confines the pair plasma magnetically and accelerates protons electrically. The fast flow of the injected pair plasma across the protons behind the initial EMP triggers the filamentation instability. Some electrons and positrons cross the injection boundary and build up a second EMP. Electron-cyclotron drift instabilities perturb the plasma ahead of both EMPs seeding a Rayleigh–Taylor (RT)-type instability. Despite equally strong perturbations ahead of both EMPs, the second EMP is much more stable than the initial one. We attribute the rapid collapse of the initial EMP to the filamentation instability, which perturbed the plasma behind it. The RT-type instability transforms the planar EMPs into transition layers, in which magnetic flux ropes and electrostatic forces due to uneven numbers of electrons and positrons slow down and compress the pair plasma and accelerate protons. In our simulation, the expansion speed of the pair cloud decreased by about an order of magnitude and its density increased by the same factor. Its small thickness implies that it is capable of separating a relativistic pair outflow from an electron-proton plasma, which is essential for collimating relativistic jets of pair plasma in collisionless astrophysical plasma.
Analysis of chaotic structures, bifurcation and soliton solutions to fractional Boussinesq model
Authors: Ali Asghar , Ahmad Jamshad , Javed Sara , Rehman Shafqat-Ur- 
Published: June 2023

Abstract
In this work, we used the space-time fractional coupled Boussinesq (STFCB) model that is essential tools in the study of quantum optics, steady physics, the variational string’s acoustic waves, ion vibrational frequencies, hydro-magnetic waves in cold plasma and many other fields. In order to put such new precise solutions of the aforementioned model, the modified Sardar-sub equation (MSSE) technique has been suggested with inside the sense of conformable derivative and the fractional order partial differential equation that is capable of changing into an ordinary differential equation by using the travelling wave transform. The scoring of solitons and other solutions demonstrates the MSSE technique compatibility for different constant values, which are shown in 3-D, 2-D and contour plots. Additionally, we discussed the examined model chaotic and dynamical tendencies. The theory of plane dynamical system is used to examine the chaotic patterns of the systems. The investigations are novel and unexamined. They can be utilized to explain the physical phenomena which have been simulated to provide details on the brief dynamical characteristics. According to numerical simulations modifying the parameters of frequencies and amplitudes has an impact on the system of dynamical properties. We indicated that the MSSE technique for creating precise solutions offers new and significant mathematical tools in applied mathematics.
Synthesis, structural, and microwave absorption properties of hematite (α-Fe2O3) and maghemite (γ-Fe2O3)
Authors: Husain H , Nurhayati N , Susanto A , Sujiono E H , Taryana Y , Krisdayanti K 
Published: June 2023

Abstract
This work demonstrated the synthesis, structural, and microwave absorption properties of hematite (α-Fe2O3) and maghemite (γ-Fe2O3) nanopowders. The desired samples are successfully synthesized from the natural ironstone of Indonesia by using the coprecipitation method. The variations of acidic environments during the synthesis process (i.e., pH 6 and 7) were done to obtain the maghemite and hematite phases. The combination of x-ray diffraction (XRD) and scanning electron microscopy (SEM) measurements was used to investigate the crystal and microstructure, respectively. Meanwhile, the vector network analyzer (VNA) was performed to examine the microwave absorption properties at x-band frequency. The structural measurements of the samples confirmed the formation of single-phase maghemite and hematite phases for precipitation pH 6 and 7, respectively, which showed the change in morphology after the precipitation process and sphere-like agglomerated particles of samples. The results Debye–Scherrer equation indicates that the crystal size of precipitated samples is on the order of nanometers. The microwave absorption characteristics through VNA measurements showed enhanced microwave absorption properties after the precipitation process; the RL
max of natural ironstone increased from −4.39 dB to −10,99 and −11,72 dB for S6 and S7 samples, respectively. Generally, the hematite and maghemite reveal the same pattern of absorption peaks. The RL
max of natural ironstone, S6, and S7 samples were observed at 10.52, 11.04, and 11,06 GHz, respectively. These results revealed that the variation of acidic environments during the synthesis process influenced the structure and microwave absorption.
A fluorescence-T1MR dual-mode analysis method for Fe3+detection in serum
Authors: Bai Wenfeng , Jin Li , Zeng Xiaodan , Liu Yaowei , Yu Shihua , Zhang Jianpo 
Published: June 2023

Abstract
Fe3+ is commonly found in living organisms and the surrounding environment, and an excessive amount of Fe3+ can cause significant harm to human health and the biological environment. Therefore, it is of great importance for human health to conduct a quantitative analysis of Fe3+. A dual-mode analytical method using MnO2/BSA/CdTe quantum dot complexes is developed for the detection of Fe3+ in solution. The variety of fluorescence intensity (F455 nm/F635 nm) of this system has an excellent linear relationship with the concentration of Fe3+ (0.7500–6.750 nmol·L−1) under the optimal conditions, and the lowest detection limit is 0.7004 nmol ·L−1. Meanwhile, the T1WI imaging performance of this system also shows a good linear relationship with concentraions of Fe3+ in a linear range of 0.7500–2.250 mmol·L−1, and the lowest detection limit of 0.2642 mmol·L−1. The quenching mechanism of this system is discussed, and results show that the interaction between Fe3+ and this system is a static quenching process. This fluorescence-T1MR dual-mode sensor is simple rapid, and easy operation, which could provide a new technology for detecting Fe3+ in solution.