bluuebunny/crossref_metadata_2025_split huggingface dataset:
History of two mass loss processes in VY CMa
Authors: Quintana-Lacaci G. , Velilla-Prieto L. , Agúndez M. , Fonfría J. P. , Cernicharo J. , Decin L. , Castro-Carrizo A. 
Published: October 2022

Context. Red supergiant stars (RSGs, Minit = 10 − 40 M⊙) are known to eject large amounts of material, as much as half of their initial mass during this evolutionary phase. However, the processes powering the mass ejection in low- and intermediate-mass stars do not work for RSGs and the mechanism that drives the ejection remains unknown. Different mechanisms have been proposed as responsible for this mass ejection including Alfvén waves, large convective cells, and magnetohydrodynamical (MHD) disturbances at the photosphere, but so far little is known about the actual processes taking place in these objects.
Aims. Here we present high angular resolution interferometric ALMA maps of VY CMa continuum and molecular emission, which resolve the structure of the ejecta with unprecedented detail. The study of the molecular emission from the ejecta around evolved stars has been shown to be an essential tool in determining the characteristics of the mass loss ejections. Our aim is thus to use the information provided by these observations to understand the ejections undergone by VY CMa and to determine their possible origins.
Methods. We inspected the kinematics of molecular emission observed. We obtained position-velocity diagrams and reconstructed the 3D structure of the gas traced by the different species. It allowed us to study the morphology and kinematics of the gas traced by the different species surrounding VY CMa.
Results. Two types of ejecta are clearly observed: extended, irregular, and vast ejecta surrounding the star that are carved by localized fast outflows. The structure of the outflows is found to be particularly flat. We present a 3D reconstruction of these outflows and proof of the carving. This indicates that two different mass loss processes take place in this massive star. We tentatively propose the physical cause for the formation of both types of structures. These results provide essential information on the mass loss processes of RSGs and thus of their further evolution.
Cluster Preface: Development and Applications of Novel Ligands/Catalysts and Mechanistic Studies on Catalysis
Authors: Zhang Zhipeng , Zhao Baoguo 
Published: October 2022

Abstract
Zhipeng Zhang (left) received his B.S. degree from Shandong University (China) in 2004, and his Ph.D. degree from the Shanghai Institute of Organic Chemistry (SIOC) in 2010 under the supervision of Professor Kuiling Ding. In 2011, he began his postdoctoral studies with Professor Benjamin List at the Max Planck Institute for Coal Research in Mülheim an der Ruhr, Germany. After three years of research on asymmetric organocatalysis, he joined the group of Professor Jin-Quan Yu at The Scripps Research Institute in La Jolla, California as a postdoctoral research associate in 2014. He subsequently worked at the Genomics Institute of the Novartis Research Foundation (GNF) from 2016, before he began his independent career as a professor at the East China University of Science and Technology (ECUST) in 2017. His current research interests include asymmetric catalysis and synthetic methodology, focusing on the design and development of novel chiral ligands and catalysts.
Baoguo Zhao (right) received his B.S. degree from Wuhan University in 1996, his M.S. degree from Nanjing University under the supervision of Professor Jianhua Xu in 2002, and his Ph.D. degree from the Shanghai Institute of Organic Chemistry (SIOC) under the supervision of Professor Kuiling Ding in 2006. He subsequently worked with Professor Yian Shi for five years as a postdoctoral fellow at the Department of Chemistry of Colorado State University. In 2011, he joined Shanghai Normal University at the Department of Chemistry as a full professor. His current research interests are in the area of biomimetic asymmetric catalysis, including the development of bioinspired chiral catalysts and synthetic methodologies.
Deep level defects in low-pressure chemical vapor deposition grown (010) β-Ga2O3
Authors: Ghadi Hemant , McGlone Joe F. , Cornuelle Evan , Feng Zixuan , Zhang Yuxuan , Meng Lingyu , Zhao Hongping , Arehart Aaron R. , Ringel Steven A. 
Published: October 2022

This study provides the full-bandgap evaluation of defect state distributions in beta phase gallium oxide (β-Ga2O3) grown by low-pressure chemical vapor deposition (LPCVD) on (010) β-Ga2O3 substrates at high growth of up to 20 µm/h. Deep-level optical spectroscopy and deep-level transient spectroscopy measurements applied to Ni/β-Ga2O3 Schottky diodes revealed the presence of a previously unreported defect state at EC-3.6 eV, which dominated the overall trap distribution in LPCVD grown material. However, states at EC-0.8 eV, EC-2.0 eV, and EC-4.4. eV were also detected, similar to prior studies on β-Ga2O3 grown by other methods, with similar or lower concentrations for the LPCVD samples. The EC-0.8 eV and EC-2.0 eV states were previously connected to residual Fe impurities and gallium vacancies, respectively. The total concentration of traps in the LPCVD material was on par with or lower than the state-of-the-art metal–organic chemical vapor deposition-grown materials despite the much higher growth rate, and the distribution of states showed negligible dependence on SiCl4 flow rate and doping concentration. These results demonstrate that the high growth rate of LPCVD-grown β-Ga2O3 is very promising for achieving thick, low defect density, and high-quality layers needed for multi-kV device applications.
Effect of electropulsing and annealing treatment on microstructure and mechanical properties of 316L stainless steel
Authors: Ma Yunrui , Dong Manling , Geng Jinfeng , Xin Weifeng , Meng Lingxiao , Yang Huajie , Zhang Zhefeng 
Published: October 2022

Considering the consumption of time and energy for the traditional heat treatment process, a new heat treatment method with high speed and low energy consumption has always been the direction of researchers. The microstructure and mechanical properties of engineering 316L stainless steel were measured under electropulsing treatment within 400 ns and annealing treatment for 2 h. Compared with the original cold-rolled state, it was found that the yield strength after 3.8 × 103 A/mm2 electropulsing treatment was reduced by 26.2% and that after 800 °C heat treatment was reduced by 27.7%. The nucleation after electropulsing treatment is mainly concentrated at one end of the lamellar grain and finally grows into the square or rhombic grain with an average grain size of 1.5 µm. After annealing, the nucleation is mainly concentrated at the grain boundaries of the lamellae and finally grows into equiaxed grains with an average grain size of 1.8 µm. Under the action of electronic wind, the recrystallization nucleation after electropulsing is mainly dominated by the mechanism of subgrain nucleation and growth. However, under the action of a uniform thermal field, the recrystallization nucleation after annealing is mainly based on the grain boundary bow-out mechanism.
Improvement of textured AlCu with Ta underlayer on LiNbO3 substrate
Authors: Achahbar H. , Bernard F. , Courjon E. , Martin N. , Baron T. , Ballandras S. 
Published: October 2022

Improving the lifetime of surface acoustic wave filters requires reduction of electromigration effects. We report on the growth mechanism of AlCu2% films deposited by the e-beam physical vapor deposition technique. The state of the art shows that the introduction of an underlayer that alters the surface free energy can change a film’s growth mode or improve the earliest stages of film formation. In this work, this will be achieved by using an ultra-thin (&lt;5 nm) Ta underlayer between the LiNbO3 substrate and the AlCu2% film. The effects of the Ta underlayer on the microstructure of AlCu2%/LiNbO3 films are investigated. An increase in the surface energy of the LiNbO3 substrate is observed with the addition of a 1.3 nm thick Ta underlayer. The crystalline quality of the AlCu2% thin film with a Ta underlayer is measured using XRD techniques. A post-deposition heat processing technique is also used to recrystallize the films. The AlCu2%/1.3Ta/LiNbO3 film annealed at 250 °C improved the electrode quality with the increase of 16% of the grain size.
Self-filtering narrowband perovskite photodetector with ultra-narrowband and high spectral rejection ratio
Authors: Liao Yuhan , Wang Xin , Pan Yuzhu , Xu Yubing , Li Qing , Zhang Xiaobing , Chen Jing , Zhu Zhuoya , Zhao Zhiwei , Ertugrul Mehmet , Furuta Mamoru , Elemike Elias Emeka , Abbasian Mojtaba , Zhou Jianming , Lei Wei 
Published: October 2022

Narrowband photodetectors have broad application prospects in many fields where only a range of specific wavelengths of light needs to be detected. However, the current narrowband detectors have some disadvantages, such as the integration is difficult, the full width at half-maximum is not narrow enough, and the spectral rejection ratio is not ideal (≤20). Here, we present a self-filtering photodetector based on MAPbX3 single crystals with a very narrow spectral response and a full width of 15 nm at half maximum. It also shows a high responsivity (∼100 mA/W) and a high spectral rejection ratio (∼300). What is more, the response spectrum can be tuned within a certain range (from 440 to 560 nm) by varying the halide composition and thus its bandgap. This provides a new design paradigm for self-filtering narrowband photodetectors.
Reinventing identity and resistance ideology in protest narratives
Authors: Aminu PraiseGod , Chiluwa Innocent 
Published: October 2022

AbstractThe Oduduwa secessionist group is a good reminder that Nigeria’s nationhood is still highly contested. Unfortunately, there appears to be very little or no linguistic research on the discourses produced by this emerging group of activists. This study examines Oduduwa agitators’ Facebook activism as a form of political communication in order to identify their prevalent ideology and techniques for constructing their group’s identity and activities.Facebook data are studied by applying Critical Discourse Analysis, more specifically van Dijk’s ideological framework, to investigate the rhetorical and discourse structures of the campaign narratives. Findings indicate that, since the Oduduwa agitators are a group of individuals determined to secede from Nigeria, the structures of their campaign discourse contain crucial metaphorical expressions that construct the group’s identity. Among those expressions, we find prejudicial generalisations, emphasis on victimisation of ‘Us’, the use of number games to stress victimhood and ideological polarisation of individuals and groups.
A text typology of social media
Authors: Berber Sardinha Tony 
Published: October 2022

AbstractThis paper introduces an initial text typology of social media posts from a multi-dimensional (MD) perspective. Text types are “[g]roupings of text that are similar in their linguistic form” (Biber 1989: 13). This text typology is based on a new MD analysis of social media messages presented in the paper. The corpus consists of 60,000 social media messages in English compiled from Facebook, Twitter, Instagram, Reddit, Telegram, and YouTube. After the texts were cleaned up, the corpus was tagged with the Biber Tagger and post-processed with the Biber Tag Count. Three dimensions of variation were determined, each representing an underlying parameter of variation. Once the texts were scored on each of the dimensions, a k-means cluster analysis was carried out, and the optimal number of clusters was determined using the Cubic Clustering Criterion statistic. A two-way typology was developed based on the dimensional characteristics of each cluster and on careful qualitative analysis of text samples.
Translation as crisis (mis)communication for culturally and linguistically diverse communities
Authors: Qi Lintao 
Published: October 2022

Abstract
Australia claims to be “the most successful immigration nation” in the world. With language services being a daily necessity, the country has a well-established translator accreditation system. To prepare for crises, Australia has also published multiple official documents with clearly laid-out management plans. All these factors seem to have contributed to Australia’s successful fight against the first two COVID-19 waves in 2020 and 2021. However, the country’s crisis communication has actually experienced constant failures to reach its culturally and linguistically diverse (CALD) communities. Taking the Australian state of Victoria as a case study, this article examines the inadequacy of COVID-19 related translation services and analyses its impact on CALD communities. Based on analysis through the lens of the 4-A principle (namely, availability, accessibility, acceptability and adaptability), the article argues that crisis translation is a specialised area, and any effective crisis communication in multicultural contexts needs to consider language experts as an essential part of the crisis response team.
Hydrothermally synthesized 2H-MoS2 under optimized conditions – A structure and morphology analysis
Authors: R Manikandan , Raina Gargi 
Published: October 2022

Abstract
In this study, we obtained the optimized conditions to synthesize pure semiconducting 2H-MoS2 nanomaterial, using a facile and scalable hydrothermal route under the variation of growth parameters such as reaction temperature, reaction time and sulfur precursors. The structural and phase identification of obtained MoS2 powders was analysed using XRD and raman spectroscopy. The reproducible formation of pure 2H-MoS2 phase is reported for the optimized reaction time of 22 h at a temperature of 200 °C using thiourea as sulfur source, with a high yield of 77.4%. FESEM analysis revealed nanoflower-like morphology of average diameter of 300–400 nm with identifiable petals of thickness ∼25 nm for the formed 2H-MoS2 under the optimized conditions. The crystallite size, strain and dislocation density were estimated theoretically using Williamson-Hall plots for the MoS2 formed under the variation of growth temperatures. Tensile strain values were obtained for MoS2 formed using thiourea, which correlated only with phase transitions from mixed 1 T/2H-MoS2 to pure 2H-MoS2. In contrast, only mixed 1 T/2H-MoS2 phase were obtained for MoS2 powders using L-Cysteine, and correspondingly the strain values were extremely small, which may be due to no phase transition observed and presence of nanosheets without curved petal-like features. The results of this study provide optimized condition for the formation of semiconducting 2H-MoS2 nanomaterial by a scalable route. This is useful for low-cost fabrication of flexible nanoelectronic devices such as non-volatile ReRAMs, supercapacitors and sensors based on 2H-MoS2.
A wavelet-based collocation technique to find the discontinuous heat source in inverse heat conduction problems
Authors: Ahsan Muhammad , Lei Weidong , Ahmad Masood , Hussein M S , Uddin Zaheer 
Published: October 2022

Abstract
This paper is devoted to an inverse problem of determining discontinuous space-wise dependent heat source in a linear parabolic equation from the measurements at the final moment. In the existing literature, a considerably accurate solution to the inverse problems with an unknown space-wise dependent heat source is impossible without introducing any type of regularization method but here we have to determine the unknown discontinuous space-wise dependent heat source accurately using the Haar wavelet collocation method (HWCM) without applying the regularization technique. This HWCM is based on finite-difference and Haar wavelets approximation to the inverse problem. In contrast to other numerical techniques, in HWCM, we used Haar functions that create a well-conditioned system of algebraic equations. The proposed method is stable and convergent because the numerical solution converges to the exact solution without observing any difficulty. Finally, some numerical examples are presented to verify the validity of the HWCM for different cases of the source term.
Estimating energy levels of a three-level atom in single and multi-parameter metrological schemes
Authors: Hosseiny Seyed Mohammad , Rangani Jahromi Hossein , Radgohar Roya , Amniat-Talab Mahdi 
Published: October 2022

Abstract
Finding the energy levels of a quantum system is a significant task, for instance, to characterize the compatibility of materials or to analyze reaction rates in drug discovery and catalysis. In this paper we investigate quantum metrology, the research field focusing on the estimation of unknown parameters investigating quantum resources, to address this problem for a three-level system interacting with laser fields. The performance of simultaneous estimation of the levels compared to independent one is also studied in various scenarios. Moreover, we introduce the Hilbert-Schmidt speed (HSS), a mathematical tool, as a powerful figure of merit for enhancing the estimation of the energy spectrum. This measure can be easily computed, since it does not require diagonalizing the density matrix of the system, verifying its efficiency to enhance quantum estimation in high-dimensional systems.
Real single-channel color image encryption method based on computational ghost imaging
Authors: Bai Xing , Li Jinxi , Yu Zhan , Yang Zhongzhuo , Wang Yujie , Chen Xingyu , Yuan Sheng , Zhou Xin 
Published: October 2022

Abstract
A real single-channel color image encryption method based on computational ghost imaging is proposed. Compared with the currently proposed color single-channel encryption scheme, the method does not decompose the color image into three gray-scale images or encode it into a grayscale image for encryption. Instead, the color speckle patterns are used as the key to directly encrypt. The ciphertext is a grayscale image and thus has camouflage properties to a certain extent. Furthermore, the optical encryption setup is easy to be implemented and the key is generated by a chaotic system, which not only guarantees security but also reduces the volume of key transmission. The feasibility and high security of this method are supported by both computer simulations and optical experiments.
Polarization sensitive photodetector based on quasi-1D ZrSe3
Authors: Wang Xingang , Xiong Tao , Xin Kaiyao , Yang Juehan , Liu Yueyang , Zhao Zeping , Liu Jianguo , Wei Zhongming 
Published: October 2022

Abstract
The in-plane anisotropy of transition metal trichalcogenides (MX3) has a significant impact on the molding of materials and MX3 is a perfect choice for polarized photodetectors. In this study, the crystal structure, optical and optoelectronic anisotropy of one kind of quasi-one-dimensional (1D) semiconductors, ZrSe3, are systematically investigated through experiments and theoretical studies. The ZrSe3-based photodetector shows impressive wide spectral response from ultraviolet (UV) to near infrared (NIR) and exhibits great optoelectrical properties with photoresponsivity of 11.9 mA·W-1 and detectivity of ~106 at 532 nm. Moreover, the dichroic ratio of ZrSe3-based polarized photodetector is around 1.1 at 808 nm. This study suggests that ZrSe3 has potential in optoelectronic applications and polarization detectors.
A review of thermal rectification in solid-state devices
Authors: Malik Faraz Kaiser , Fobelets Kristel 
Published: October 2022

Abstract
Thermal rectification, or the asymmetric transport of heat along a structure, has recently been investigated as a potential solution to the thermal management issues that accompany the miniaturization of electronic devices. Applications of this concept in thermal logic circuits analogous to existing electronics-based processor logic have also been proposed. This review highlights some of the techniques that have been recently investigated for their potential to induce asymmetric thermal conductivity in solid-state structures that are composed of materials of interest to the electronics industry. These rectification approaches are compared in terms of their quantitative performance, as well as the range of practical applications that they would be best suited to. Techniques applicable to a range of length scales, from the continuum regime to quantum dots, are discussed, and where available, experimental findings that build upon numerical simulations or analytical predictions are also highlighted.
A deep trench super-junction LDMOS with double charge compensation layer
Authors: Wu Lijuan , Su Shaolian , Chen Xing , Zeng Jinsheng , Wu Haifeng 
Published: October 2022

Abstract
A deep trench super-junction LDMOS with double charge compensation layer (DC DT SJ LDMOS) is proposed in this paper. Due to the capacitance effect of the deep trench which is known as silicon–insulator–silicon (SIS) capacitance, the charge balance in the super-junction region of the conventional deep trench SJ LDMOS (Con. DT SJ LDMOS) device will be broken, resulting in breakdown voltage (BV) of the device drops. DC DT SJ LDMOS solves the SIS capacitance effect by adding a vertical variable doped charge compensation layer and a triangular charge compensation layer inside the Con. DT SJ LDMOS device. Therefore, the drift region reaches an ideal charge balance state again. The electric field is optimized by double charge compensation and gate field plate so that the breakdown voltage of the proposed device is improved sharply, meanwhile the enlarged on-current region reduces its specific on-resistance. The simulation results show that compared with the Con. DT SJ LDMOS, the BV of the DC DT SJ LDMOS has been increased from 549.5 to 705.5 V, and the R
on,sp decreased to 23.7 mΩ·cm2.
A lightweight, user-configurable detector ASIC digital architecture with on-chip data compression for MHz X-ray coherent diffraction imaging
Authors: Strempfer Sebastian , Zhou Tao , Yoshii Kazutomo , Hammer Mike , Babu Anakha , Bycul Dawid , Weizeorick John , Cherukara Mathew J. , Miceli Antonino 
Published: October 2022

Abstract
Today, most X-ray pixel detectors used at light sources
transmit raw pixel data off the detector ASIC. With the availability
of more advanced ASIC technology nodes for scientific application,
more digital functionalities from the computing domains (e.g.,
compression) can be integrated directly into a detector ASIC to
increase data velocity. In this paper, we describe a lightweight,
user-configurable detector ASIC digital architecture with on-chip
compression which can be implemented in 130 nm technologies in a
reasonable area on the ASIC periphery. In addition, we present a
design to efficiently handle the variable data from the stream of
parallel compressors. The architecture includes user-selectable
lossy and lossless compression blocks. The impact of lossy
compression algorithms is evaluated on simulated and experimental
X-ray ptychography datasets. This architecture is a practical
approach to increase pixel detector frame rates towards the
continuous 1 MHz regime for not only coherent imaging techniques
such as ptychography, but also for other diffraction techniques at
X-ray light sources.