bluuebunny/crossref_metadata_2025_split huggingface dataset:
Capacitive coupling of coherent quantum phase slip qubits to a resonator
Authors: Hönigl-Decrinis Teresa , Antonov Ilya , Shaikhaidarov Rais , Ho Kim Kyung , Antonov Vladimir N , Astafiev Oleg V 
Published: October 2023

Abstract
We demonstrate capacitive coupling of coherent quantum phase slip (CQPS) flux qubits to a resonator patterned on a highly disordered TiN film. We are able to detect and characterise CQPS flux qubits with linewidths down to

Δ
ω
=
12
±
1
MHz

on several resonator modes, and show that, unlike inductive coupling, here the coupling strength does not depend on the qubit’s energy. Since the qubit is galvanically decoupled from the resonator, our approach provides flexibility in material, design and fabrication choices for CQPS-based devices. Our results are two-fold: we report CQPS in TiN and demonstrate, to our knowledge for the first time, capacitive coupling of a CQPS flux qubit.
Back-stepping projective synchronization of fractional-order unified systems based on the lower triangular structure
Authors: Peng Chenchen , Yang Anqing , Lin Xumei , Ren Ling , Zhao Zihao 
Published: October 2023

Abstract
The synchronization of fractional-order chaotic systems (FOCSs) plays an important role in modern control theory, the projective synchronization (PS) as a class of synchronization problems, also has huge applications and has attracted much attention. It is, however, shown in the obtained literature that the results on the PS of FOCSs either loss the rigorous theoretical demonstration or verify from the viewpoint of numerical simulations. How to derive a necessary and sufficient condition to guarantee the PS of complex FOCSs by a simple controller is still open. To this end, this article is concerned with the PS of fractional-order unified systems (FO-USs) that are important in FOCSs covering fractional-order Lorenz, Chen and Lü systems, where the controller is presented based on the lower triangular structure by use of the back-stepping technique. The necessary and sufficient criterion for the PS of FO-USs is proposed by solving an algebraic equation, and the controller for the PS of FO-USs is derived based on the lower triangular structure combined with back-stepping approach. Finally, the simulation results are reported to verify the correctness and efficiency of the obtained results.
Clustering of primordial black holes from QCD axion bubbles
Authors: Kasai Kentaro , Kawasaki Masahiro , Kitajima Naoya , Murai Kai , Neda Shunsuke , Takahashi Fuminobu 
Published: October 2023

Abstract
We study the clustering of primordial black holes (PBHs) and axion miniclusters produced
in the model proposed to explain the LIGO/Virgo events or the seeds of the supermassive black
holes (SMBHs) in ref. [1]. It is found that this model predicts large
isocurvature perturbations due to the clustering of PBHs and axion miniclusters, from which we
obtain stringent constraints on the model parameters. Specifically, for the axion decay constant
fa
= 1016 GeV, which potentially accounts for the seeds of the SMBHs, the PBH
fraction in dark matter should be f
PBH ≲ 7 × 10-10. Assuming that the
mass of PBHs increases by more than a factor of 𝒪(10) due to accretion, this is
consistent with the observed abundance of SMBHs. On the other hand, for
fa
= 1017 GeV required to produce PBHs of masses detected in the LIGO/Virgo, the PBH
fraction should be f
PBH ≲ 6 × 10-8, which may be too small to explain the
LIGO/Virgo events, although there is a significant uncertainty in calculating the merger rate in
the presence of clustering.
On the Identification of N-rich Metal-poor Field Stars with Future Chinese Space Station Telescope
Authors: Zhang Jiajun , Tang Baitian , Chang Jiang , Xue Xiangxiang , Fernández-Trincado José G. , Li Chengyuan , Wang Long , Tian Hao , Huang Yang 
Published: October 2023

Abstract
During the long term evolution of globular clusters (GCs), some member stars are lost to the field. The recently found nitrogen-rich (N-rich) metal-poor field stars are promising candidates of these GC escapees, since N enhancement is the fingerprint of chemically enhanced populations in GCs. In this work, we discuss the possibility of identifying N-rich metal-poor field stars with the upcoming Chinese Space Station Telescope (CSST). We focus on the main survey camera with NUV, u, g, r, i, z, y filters and slitless spectrograph with a resolution about 200. The combination of UV sensitive equipment and prominent N-related molecular lines in the UV band bodes well for the identification: the color–color diagram of (u − g) versus (g − r) is capable of separating N-rich field stars from normal halo stars, if metallicity can be estimated without using the information on u-band photometry. Besides, the synthetic spectra show that a signal-to-noise ratio of 10 is sufficient to identify N-rich field stars. In the near future, a large sample of N-rich field stars found by CSST, combined with state-of-the-art N-body simulations will be crucial to deciphering GC-Galaxy co-evolution.
Investigation of a low frequency coherent mode in Wendelstein 7-X with island divertor
Authors: Xiang H.M. , Krämer-Flecken A. , Han X. , Windisch T. , Weir G. , Rahbarnia K. , Schilling J. , Thomsen H. , Mendes S.vaz , Knieps A. , Vécsei M. , Otte M. , Zoletnik S. , Anda G. , Dunai D. , Zhang D. , Kornejew P. , Huang J. , Zhang T. , Lin X.D. , Gao X. , Liang Y. ,   the W7-X team
Published: October 2023

Abstract
During the island divertor operation of W7-X, especially in standard magnetic configuration (with 5/5 island chain in the scrape-off-layer (SOL)), quasi-periodic electromagnetic oscillation is observed. It appears in the frequency range of 1 kHz–2 kHz, therefore it is called the low frequency mode (LFM) within this paper. It is observed by multiple diagnostics, amongst them, a poloidal correlation reflectometer allowing radial localization of the LFM. The LFM is localized in the SOL and shows an obvious modulation effect on the plasma perpendicular velocity (

V

⊥

). Furthermore, broadband turbulence is observed in the fluctuation spectra of the electron density and the magnetic field and the perpendicular correlation length of turbulence eddies are modulated. The calculation of the poloidal flow velocity and its oscillation allows us to study the effect of the LFM on the flow. Cross correlation analysis shows that the perpendicular flow oscillation and the turbulence modulation are closely correlated. The application of external control coils to adjust the island size and position result in a strong modification of the magnetic topology at the plasma edge which affects the appearance, amplitude and frequency of the LFM. Bi-coherence analysis indicates that nonlinear interactions among turbulence components is a possible mechanism for the generation of the LFM.
The use of immersive technologies in teaching mathematics to vocational students
Authors: Kramarenko T H , Kochina O S 
Published: October 2023

Abstract
This study examines the use of immersive technologies in teaching mathematics to vocational students. The purpose of the research is to develop theoretical foundations and practical applications for the use of immersive technologies in mathematics education, and to measure the impact of these technologies on student motivation and learning outcomes. The study considers the scientific and theoretical underpinnings of immersive technologies in mathematics teaching, as well as methods for using the AR-Book application. A theoretical model, criteria, and methodological support for evaluating the use of immersive technologies are developed. A pedagogical experiment is conducted to evaluate the impact of these technologies on vocational students. Based on the results of the experiment and training materials, the study presents generalizations on the use of immersive technologies in mathematics education.
Laboratory equipment for practice learning in the framework of educational course “Molecular Physics and Thermodynamics”
Authors: Pursky O I , Gamaliy V F , Demidov P G , Dubovyk T V , Buchatska I O , Forostyana N P 
Published: October 2023

Abstract
This article presents laboratory equipment for practice learning of physics specialties students in the framework of educational course “Molecular Physics and Thermodynamics”. The presented laboratory equipment allows measuring the temperature dependence of the thermal conductivity coefficient of molecular liquids under atmospheric pressure and saturated vapors pressure in the temperature range from 150K to 400K. A general scheme of the developed experimental setup for measuring the thermal conductivity of liquids by the steady-state method under isobaric condition has been described. The created laboratory setup uses general design solutions of the coaxial cylinder method, preserving its features and measurement precision in general. The measurements are carried out on coaxial-geometry cell under atmospheric pressure. A modified heat potentiometer method with one thermometer was used, which allowed us to minimize the error in the estimation of the thermal conductivity coefficient due to the uncontrollable heat flows and different calibration of thermometers. The total systematic error in the measurement of the molecular liquids thermal conductivity does not exceed 3%. The procedures for direct measurement and calculation of the thermal conductivity coefficient of molecular liquids using the developed laboratory equipment are described.
Technology of creating educational content for open digital resources in general technical disciplines
Authors: Dotsenko N A , Gorbenko O A , Haleeva A P 
Published: October 2023

Abstract
The article presents the technology of creating educational content for open digital resources in general technical disciplines that consist of the four stages: development, design, posting and final. There are proposed to create video, interactive and graphic educational content in the context of the proposed technology at the development stage. Video content is presented in the form of video lectures, video instructions for practical and laboratory tasks, video recording of the educational results. Interactive content is introduced by lectures and laboratory tasks with interactive elements, interactive posters or tests. Graphic content is provided by lectures with graphic models of the technical objects, practical tasks with the use of modelling and design programs, creation of 3D models for laboratory works and performing engineering and technical projects. The design stage includes the selection of services for the specific type of content and creation the tasks for open digital resources. Educational content is implemented in an open digital resource by obtaining a link, QR or implementation code at the posting stage. The final stage of the application of the proposed technology involves the performance of tasks by higher education applicants, obtaining points, acquisition of competencies. The Pearson criterion was used to statistically verify the application of technology of creating educational content for open digital resources in general technical disciplines. The higher education applicants in the experimental group received higher results than in the control group which may indicate the effectiveness of the outlined technology.
Technologization of sudden cardiac death prevention based on the disciplinary-methodological matrix of health-preserving competence
Authors: Fedorets V M , Klochko O V 
Published: October 2023

AbstractThe article presents the educational meta-technology of the disciplinary-methodological matrix of the health-preserving competence of the physical education teacher using the example of the prevention of sudden cardiac death during physical exertion. The disciplinary-methodical matrix is considered as a cognitive-value-educational and anthropoculturally oriented metatechnology developed by integrating various disciplines (and their systems) (mainly anthropologically and health-preserving oriented), systems of knowledge, discourses and narratives, ideas, values, meanings, methods and problematization and conceptualization strategies, etc. An actual aspect of this technology is the purposeful development of methodical disciplines in which attention is purposefully focused on a certain aspect of learning. The basis of the “Etiological method of prevention of sudden cardiac death” is the idea of an etiological (causal) approach actualized within the framework of the methodical discipline “Patopedagogy” formed on the basis of the transfer of knowledge from the medical science of pathology. As a result of an experimental study aimed at studying the dynamics of the formation of the cognitive and cognitive ability of physical education teachers for the prevention of sudden cardiac death, the positive dynamics of educational results is determined. This depends on the effectiveness of the application of the disciplinary-methodological matrix of health-preserving competence in physical education teacher. The necessary disciplinary and methodological matrices can be constructed for the formation of various competencies and goals and design of training.
Digitization of learning environment of higher education institutions: conceptual foundations and practical cases
Authors: Kuzminska O H , Morze N V , Osadchyi V V 
Published: October 2023

Abstract
Digital transformation involves the use of digital technologies for rebuilding processes and increasing their efficiency. It is confirmed by the results of the research on transformational processes in various spheres. This research paper deals with the development (modernization) of digital learning environments of higher education institutions, which creates conditions for creating models of real production and social processes by means of modern digital technologies. It will strengthen the competence potential of all the stakeholders of higher education institutions, which train specialists in digital technologies. The need to upgrade the existing educational environments of higher education institutions in the context of crisis situations related to global challenges (for example, COVID-19) or the specifics of a specific country (the war in Ukraine) or an educational institution is substantiated. The research paper specifies a conceptual model of the next generation digital learning environment of a higher education institution, which involves the distribution of resource distribution and provision of integration of resources, data and users according to three levels (micro, meso and macro levels), and provides the cases of its implementation in National University of Life and Environmental Sciences of Ukraine and Borys Grinchenko Kyiv University. The monitoring data are presented both at the level of external (development of the component composition of the environment) and internal (change of organizational processes according to the students’ demand) design of the environment. The need for designing a change management system at the level of a higher education institution or its structural subdivisions is identified.
The issues of design of a Petri net-based software component for modelling holistic and coordinated curriculum for potential specialists’ training
Authors: Bilousova L I , Gryzun L E 
Published: October 2023

Abstract
This paper proposes a Petri nets-based software component for automating the holistic and coordinated curriculum building process for pre-service IT specialists. The design of the software module is based on the holistic educational paradigm and the authors’ approach to Petri nets-based curriculum modeling. The core components of the software module are identified and their requirements are formulated. The groups of software classes are specified and described. The benefits of the software module for pre-service IT specialists are highlighted. The prospects for further research include implementing the software module and testing it on specially prepared cases.
Selection of Foundation Types for Mechanized Construction of 220 kV Overhead Transmission Lines in Mountainous Areas Suitable for Fujian Province
Authors: Huang Xiaoyu , Wu Fenqian , Lin Shaoyuan , Zhang Wenxiang 
Published: October 2023

Abstract
The construction of overhead transmission lines in mountainous areas poses a significant challenge when it comes to foundation construction. The type of foundation selected in these areas has a direct impact on equipment selection and access road planning. Fujian Province, located on the southeastern coast of China, is predominantly hilly and mountainous. Therefore, selecting an appropriate foundation for overhead transmission lines is crucial for successful mechanized construction of transmission lines in this region. In this study, we aimed to enhance the economy of mechanized construction of the foundation of the 220 kV overhead transmission lines in Fujian Province. We analyzed the typical geological conditions and foundation reactions in the area and compared the construction costs of mechanical pile foundations, mechanical digging foundations, and rock anchor foundations. The results show that the mechanical pile foundation requires the least amount of concrete when the foundation reaction of the 220 kV suspension tower is less than 1700 kN and the foundation reaction of the 220 kV tension tower is less than 1300 kN. Additionally, the quantity of the rock anchor foundation is less than that of the digging foundation. In terms of cost, the rock anchor foundation is the most economical, followed by the mechanical pile foundation and then the digging foundation.
Compressive Sensing Optimization Algorithm for Indoor Visible Light 3D Positioning
Authors: Cheng Yue , Shao Jianhua , Wu Ruiqi 
Published: October 2023

Abstract
A compressive sensing optimization algorithm for indoor three-dimensional (3D) positioning based on visible light was proposed in this paper. This is the first work that applies compressive sensing to indoor 3D positioning. The solution of the fingerprint’s weight was transformed into a compressive sensing reconstruction, the coordinates of the point to be positioned are obtained by reconstruction using the KNN algorithm and the grey wolf optimization (GWO) algorithm. The self-exploration GWO (SEGWO) algorithm was proposed by introducing a self-exploration mechanism into GWO to improve the convergence performance of the algorithm. The localization error of the proposed method in 3D space is 5.79cm, which is significantly lower than other similar algorithms.
Athermalization of Optical System with Large Field of View for Image Navigation
Authors: Zhang Jialei , Xue Yaoke , Zhou Canglong , Lin Shangmin , Liu Meiying 
Published: October 2023

Abstract
Image navigation sensor is one of the most important sensing means for human to explore the extraterrestrial space environment, and optical system is a key component of image navigation sensor, directly determines the amount of information perceived. The optical system requirements of image navigation sensors are gradually developing towards large field of view and miniaturization. The fisheye lens is the first choice for large field of view imaging by selecting the appropriate optical structure, without adding other additional components, and has the advantages of small size and strong perception energy. However, as the image surface illuminance of fisheye lens will decrease sharply with the increase of the field of view, the change of temperature will also degrade the imaging quality of the system, and strong stray light sources such as the sun will easily enter the field of view, which will greatly affect the perception ability of the system. Because of this, effective design of these systems is quite difficult. In this paper, a reverse-telephoto structure was used for large-field imaging, and the degradation of imaging quality caused by temperature changes was eliminated by selecting appropriate optical and mechanical materials. Designed with a focal length of 6.7mm, an F number of 3.6, a viewing angle of 130°, a working band of 0.45μm to 0.65μm, an after work distance of 7mm, a total system length≤60mm, we tested our system in a -40°C to +60°C temperature range and measured the image quality. Through simulation analysis, the system in the whole field of view within our spot diagrams was≤5.5μm, optical transfer function was greater than 0.2 at 90lp/mm, and no vignetting occurred. Furthermore, the imaging illumination of the edge field of view was 0.72 times that of the center field of view, the f – tan (θ) relative distortion value of the center field of view was≤2.3%, and the f – θ relative distortion value of the edge field of view was≤2.7%. Compared to normal temperatures, the optical transfer function changes at -20°C and +40°C were 0.02 and 0.01, respectively. Thus, the system displayed the characteristics of excellent image quality, small size, high energy utilization rate and good non-thermal performance.
Application of Negative Poisson’s Ratio Honeycomb Structure in Acceleration Measurements
Authors: Li Pengju , Liu Yinghan , Li Dawei , Zhang Zhengkai , Wen Qingguo 
Published: October 2023

Abstract
The measurement of acceleration plays an essential role in evaluating the state of mechanical equipment. The acceleration transducers are the most widely used devices for measuring vibration, motion, and shock. This paper proposes a novel method of acceleration measurement based on auxetic honeycomb structure. By using this method, the change in the auxetic honeycomb structure’s transmittance caused by elastic deformation under acceleration can be converted into a change in solar cell’s output. Geometric analysis and experiments are performed to investigate the effectiveness of the proposed method. The results provide a new structural insight for acceleration sensors. In order to assess the efficacy of the proposed approach, geometric analysis and experiments are conducted. The resonance frequency of an acceleration measurement device using an auxetic structure is approximately 100Hz, while for a device using a non-auxetic structure, it is about 40Hz, both reaching the maximum wavelength variation. The results give potential paths for future study as well as new structural insights for acceleration sensors.
Influence of Temperature on 17-4PH Characteristics of Torque Sensor Elastomer
Authors: Lin Jiejun , Jiang Weijie , Zhao Dingding , Li Tao 
Published: October 2023

Abstract
The elastomer is the core component of the torque sensor, and its performance directly affects the accuracy of the torque sensor. The elastic modulus, as a key parameter of elastomers, can affect the output performance of sensors at extreme temperatures due to the temperature response. In this paper, the mathematical model of the torque sensor is analyzed, and the theoretical model of the elastic modulus of the material under the action of temperature is constructed. Then, the temperature performance test and the torque calibration test under the changing temperature environment are carried out for the elastomer made of 17-4PH material. The test results show that the relationship between the elastic modulus of the elastomer and the temperature is nonlinear, and the higher the temperature, the faster the elastic modulus decreases. The change law of the elastic modulus model considering the temperature effect is consistent with the change of the sensor output value, which provides a reliable basis for the precise design of the torque sensor.