bluuebunny/crossref_metadata_2025_split huggingface dataset:
Recension of boron nitride phase diagram based on high-pressure and high-temperature experiments
Authors: Zhang 张 Ruike 瑞柯 , Guo 郭 Ruiang 睿昂 , Li 李 Qian 倩 , Li 李 Shuaiqi 帅琦 , Long 龙 Haidong 海东 , He 贺 Duanwei 端威 
Published: August 2024

Abstract
Cubic boron nitride and hexagonal boron nitride are the two predominant crystalline structures of boron nitride. They can interconvert under varying pressure and temperature conditions. However, this transformation requires overcoming significant potential barriers in dynamics, which poses great difficulty in determining the c-BN/h-BN phase boundary. This study used high-pressure in situ differential thermal measurements to ascertain the temperature of h-BN/c-BN conversion within the commonly used pressure range (3–6 GPa) for the industrial synthesis of c-BN to constrain the P–T phase boundary of h-BN/c-BN in the pressure–temperature range as much as possible. Based on the analysis of the experimental data, it is determined that the relationship between pressure and temperature conforms to the following equation:

P
=
a
+

1
b

T

. Here, P denotes the pressure (GPa) and T is the temperature (K). The coefficients are a = −3.8±0.8 GPa and b = 229.8±17.1 GPa/K. These findings call into question existing high-pressure and high-temperature phase diagrams of boron nitride, which seem to overstate the phase boundary temperature between c-BN and h-BN. The BN phase diagram obtained from this study can provide critical temperature and pressure condition guidance for the industrial synthesis of c-BN, thus optimizing synthesis efficiency and product performance.
Single pair of charge-2 Dirac and charge-2Weyl phonons in GeO2
Authors: He 何 Dong-Chang 东昌 , Liu 刘 Jia-Xi 嘉希 , Liu 刘 Pei-Tao 培涛 , Li 李 Jiang-Xu 江旭 , Chen 陈 Xing-Qiu 星秋 
Published: August 2024

Abstract
The presence of a pair of Weyl and Dirac points (WP–DP) in topological semimetal states is intriguing and sought after due to the effects associated with chiral topological charges. However, identifying these states in real materials poses a significant challenge. In this study, by means of first-principles calculations we predict the coexistence of charge-2 Dirac and charge-2 Weyl phonons at high-symmetry points within a noncentrosymmetric P41212 space group. Furthermore, we propose GeO2 as an ideal candidate for realizing these states. Notably, we observe two distinct surface arcs that connect the Dirac and Weyl points across the entire Brillouin zone, which could facilitate their detection in future experimental investigations. This study not only presents a tangible material for experimentalists to explore the topological properties of WP–DP states but also opens up new avenues in the quest for ideal platforms to study chiral particles.
Intercontinental frequency ratio measurement of

171

Yb and

88

Sr optical lattice clocks
Authors: Morzyński Piotr , Bilicki Sławomir , Bober Marcin , Kovačić Domagoj , Ciuryło Roman , Zawada Michał , Nawrocki Jerzy , Dunst Piotr , Kobayashi Takumi , Hosaka Kazumoto , Akamatsu Daisuke 
Published: August 2024

Abstract
We report a remote, intercontinental frequency comparison between 171Yb (NMIJ) and 88Sr (UMK) optical lattice clocks. The frequencies were compared via the Global Positioning System Precise Point Positioning technique over the period from 10 March 2020, 00:00 UTC until 15 March 2020, 00:00 UTC. The comparison of the optical clocks yields results with a relative frequency uncertainty of

6.3
×

10

−
15

.
Research on the charging strategy of battery swapping stations under the optimization of peak-valley electricity price of electrical technology
Authors: Cai Xin , Chen Liangliang , Han Huachun 
Published: August 2024

Abstract
With the deepening reform of the intelligent power grid, electric technology has become an important part of the high-tech industry. Against the background of peak-valley electricity prices, this paper studies the charging strategy of battery swapping stations considering scene reduction technology. First, the electric passenger vehicle replacement demand scenario set is simulated. Then, the scenario reduction technology based on Kantorovich distance is adopted to effectively reduce the scenario set of power change demand by week. Finally, the proposed charging strategy considering the peak-valley electricity price of the electrical technology mechanism is analyzed and verified. The results show that the strategy can effectively reduce the battery charging cost and realize the economic operation of the battery swapping station.
Sequence impedance modeling of grid-following LC-type voltage source converter
Authors: Chen Yu , Sun Chenghao , Qi Fujun , Zhang Haijuan , Chu Xiaodong , Ye Hua 
Published: August 2024

Abstract
This paper establishes the impedance model of a grid-following converter without grabbing control delay and frequency coupling effects into attention, and uses the sinusoidal linearization to operate method to create both sides of the sequence impedance model in order to study the oscillation problem of power systems that contain renewable energy. The grid-connected system’s stability will be evaluated in light of this. MATLAB/Simulink simulations were completed to inspect the veracity of the created resistance model and the reliability analysis results.
Dual virtual vector duty cycle model predicts power control of dual three-phase permanent magnet generator
Authors: Zhang Bo , Liu Weiting 
Published: August 2024

Abstract
The large vector model for predicting power control (MPPC) of a traditional two-three-phase permanent magnet synchronous generator is used to solve the problems of high current harmonics, sharp power pulsation, and unstable phase current. A dual virtual vector duty cycle model is proposed to predict power control. This method obtains 12 virtual voltage vectors by selecting the two vectors of the outermost and secondary outer layers of the rectifier, and then directly introduces the 12 virtual voltage vectors into the power value function for iterating, and then obtains an optimal virtual vector that minimizes the value function. The two vectors adjacent to the optimal vector are brought into the value function, and the suboptimal vector that makes the value function smaller is selected. Finally, the duty cycle modulation is carried out together with the zero vector, and the function of each vector is calculated by using the idea of no beat. The experimental results show that the double virtual vector duty cycle MPPC can effectively reduce current harmonics, reduce current and power pulsation, and improve current stability.
Fault line selection algorithm for single-phase grounding faults in distribution networks based on multi-feature fusion of multi-level wavelet decomposition coefficients
Authors: Li Jinyao , Wu Shouyuan , Gao Lixue 
Published: August 2024

Abstract
This paper introduces a novel method for determining fault lines, addressing the time-consuming nature of traditional steady-state quantity methods and the susceptibility to errors in transient quantity methods. A multi-feature fusion technique, involving multi-level wavelet decomposition coefficients, is employed. This involves the extraction of zero-sequence current wavelet transform coefficients with the Discrete Wavelet Transform (DWT), and the formation of a similarity function through the S-transform. Subsequently, an energy measure function is derived by integrating these coefficients. A function representing faultiness, aligned with various fault lines, is then developed and used as the primary criterion for identifying the faulted line. Simulation data from a single-phase grounding fault model in a distribution network confirms the efficacy of the method in choosing fault lines.
Physical neural network using skyrmion-based spin torque nano-oscillators
Authors: Xiong Shan , Liang Xue , Xing Xiangjun , Zhou Yan 
Published: August 2024

Abstract
Due to physical limitations on the miniaturization of traditional electronic devices, architectures based on emerging principles have become the focus of current research to meet the needs of rapidly developing information technologies in the post-Moore era. Neuromorphic devices hold huge potential for use in future artificial intelligence (AI) chips beyond conventional architectures. Benefiting from a wealth of nonlinear dynamic characteristics of spin torque nano-oscillators (STNOs), studies of neuromorphic computations and their applications based on STNOs are attracting growing attention. In this article, at first, we construct a magnetic skyrmion-based STNO and analyze its characteristics; on this basis, we propose a physical echo state network (ESN) including eight skyrmion-based STNOs, which is utilized to implement an image recognition task. Micromagnetic simulations of the nonlinear response of skyrmion-based STNOs to current pulses imply that such a physical neural network has remarked performance in handwritten digit recognition. The high precision, low energy consumption, and fast processing speed of STNO-based neuromorphic devices are desirable in multitudinous practical applications, possibly leveraging the use of STNO-based physical neural networks in the field of artificial intelligence.
Automatic detection system of secondary equipment in smart substation based on decision tree and support vector machine
Authors: Fu Zhong , Song Pengfei 
Published: August 2024

Abstract
Because the current method is not effective in detecting secondary equipment in smart substations, the actual loss value is unstable and the recall rate is low, and the expected detection effect cannot be achieved, an automatic detection system for secondary equipment in smart substation based on decision tree and support vector machine is designed. Firstly, the connection structure of the front-end detection circuit is designed, and the detection sensor is designed by combining the current sensor, voltage sensor, and power factor sensor. A decision tree is used to sample the detection data, and kernel function is introduced to convert nonlinear data into linear data under support vector machine, to realize the transformation of secondary equipment data in smart substation from low dimension to high dimension and complete the design of automatic detection system. The experimental results show that the detection effect of the designed system is closer to the actual loss value under some actual losses, which can improve the automatic detection effect. The designed system has the best performance in the recall rate, with little fluctuation and the most stable performance.
Modification and characterisation of nickel-based alloy materials for ultra-supercritical power generation
Authors: Zhang Xiaolong 
Published: August 2024

Abstract
Ultra-supercritical power generation technology has consistently pioneered energy-efficient utilization techniques, with the development and application of tubing serving as the cornerstone for ultra-supercritical power plant units. Among numerous candidate materials, nickel-based alloys have garnered widespread attention due to their exceptional high-temperature strength and corrosion resistance. This study primarily delineates the modification techniques employed for nickel-based alloy materials utilized in 700°C ultra-supercritical units, encompassing solid-solution strengthening, high-entropy alloys, additive manufacturing, and surface-coating. Additionally, this paper consolidates characterization methodologies for nickel-based alloys, focusing on morphological and crystallinity characterization and mechanical performance evaluations, thereby offering valuable insights and guidance for researchers in this field.
Ti3AlC2-modified NiCrAlY as a metallic bond coat for thermal barrier coatings: a study on high-temperature oxidation resistance
Authors: He Wenbin , Li Junliang , Liu Kun 
Published: August 2024

Abstract
Thermal barrier coatings (TBCs) are employed in high-temperature gas turbines to reduce the surface temperature of metallic components such as turbine blades. In order to enhance the operational performance of conventional TBCs under high-temperature and high-pressure conditions, this study designs and prepares a novel TBC with YSZ as the ceramic layer and NiCrAlY as the bond coat. Different amounts of Ti3AlC2 particles (5wt%, 10wt%, and 15wt%) are added to the bond coat. The microstructure and organization of the coatings are characterized by using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The resistance to high-temperature oxidation of the coatings is evaluated through atmospheric muffle furnace testing. When the Ti3AlC2 content is 5wt%, the coating exhibits less weight gain than traditional TBCs after oxidation at 950°C for 80 hours. Compared to coatings with Ti3AlC2 content of 10wt% and 15wt%, the coating with 5wt% Ti3AlC2 achieves the optimal resistance to high-temperature oxidation.
Mode I interlaminar fracture toughness of glare laminates by single cantilever beam
Authors: Hua Xiaoge , Tian Zheng 
Published: August 2024

Abstract
GLARE laminates, also known as Glass Fiber Reinforced Aluminum Laminates, have emerged as critical materials for fuselage and wing skin applications due to their outstanding fatigue resistance and good damage tolerance. Among the various modes of failure in GLARE laminates, interfacial delamination plays a significant role in determining their overall performance. However, GLARE laminates suffer complicated failure mechanisms and have a complex multi-interface system. Clearly, it is crucial to accurately determine the feasibility and accuracy of the SCB (Single Cantilever Beam) method for GLARE laminates by combining finite element simulation with experiments. Meanwhile, a detailed investigation was conducted on the influence of fiber laying and the loading rate of GLARE laminates. The findings revealed that the SCB tests resulted in pure Mode I interlaminar fracture failure. Furthermore, it was observed that loading rates range of 1~5 mm/min achieves reasonable and effective Mode I interlaminar fracture toughness. Additionally, finite element simulation results demonstrated the absence of in-plane shear failure within the fiber layer, leading to the production of pure Mode I interlaminar fracture.
Mass-controlled contact variable stiffness elastic metamaterials for bandgap tuning
Authors: Lyu Ronghao , Zhang Kai 
Published: August 2024

Abstract
The tunability of elastic metamaterials has emerged as a focal point in recent years within the realm of metamaterial research. However, achieving extensive bandgap tuning at low frequencies and identifying appropriate control mechanisms remain challenging tasks in existing studies. In this research, we propose a novel approach based on mass-controlled contact-variable stiffness locally resonant elastic metamaterials. By altering the mass and orientation of oscillators, the contact state of the variable stiffness structure can be modified within the unit cell, resulting in significant variations in effective stiffness and enabling broad bandgap tuning at low frequencies. Furthermore, the gravitational field control method employed in this study offers simplicity, rapidity, and ease of manipulation. The materials utilized in this research are readily accessible, and the structure’s simplicity facilitates ease of fabrication, thus holding promise for practical applications in scenarios such as vibration and noise reduction in ships, vehicles, buildings, and other related fields.
Research on the effect of mg doping on the properties of ZnO nanorods
Authors: Tian Xue , Yang Yingying , Sun Yuanping 
Published: August 2024

Abstract
Semiconductor materials, as the core of the new generation of information technology, and nano ZnO as the third-generation semiconductor, have high absorption and transparency in the visible light range, as well as a wide bandgap, making it widely applicable in the field of optoelectronic components. This article prepared Mg-doped ZnO nanorods using a low-temperature water bath method and studied the effect of Mg doping on the structure and luminescent properties of the samples using scanning electron microscopy (SEM), X-ray diffraction (XRD), and photoluminescence (PL) analysis. The SEM results indicate that the obtained sample has a double-columnar ZnO nanorod structure. As the Mg doping concentration increases, the size of ZnO nanorods first increases and then decreases. When the Mg doping concentration reaches 2%, the size of ZnO nanorods reaches its maximum, about 7.94 μm. The XRD results indicate that the obtained ZnO sample has a hexagonal wurtzite structure, and there is no additional Mg impurity phase in the sample, indicating that Mg2+ has successfully replaced Zn2+ into the lattice. The PL spectrum indicates that the obtained sample has a maximum UV emission value of around 395 nm and exhibits green (520 nm, 566 nm) and orange (600 nm) luminescence characteristics. With the increase of Mg doping concentration, the UV emission peak strengthens and shifts red, and the visible emission peak weakens, which improves the photocatalytic performance of ZnO nanorods.
Effect of salt concentration on the antibubble lifetime
Authors: Liu Shuheng , An Ji , Liu Ziqi , Zhao Guilin , Gao Rui 
Published: August 2024

Abstract
Antibubble lifetime has attracted increasing attention since it limits the practical applications of antibubbles. This paper presents an experimental study on the effect of salt concentration on the antibubble lifetime. With a uniform salt solution by fully stirring, the antibubble lifetime is observed to increase first but then decrease with the salt concentration. The lifetime extension is not significant. However, in a nonuniform salt solution without stirring, the generated heavy antibubbles suspended near the container’s bottom have a much longer lifetime, about an order of magnitude higher. Along with the free dissolution of salt, a blurred liquid layer emerges near the container’s bottom due to the formation of worm-like micelles. These micelles endow the liquid viscoelastic properties and slow down the air drainage in the film, leading to a significantly longer lifetime. This study provides a feasible method to investigate the air drainage in the film because of the slow drainage speed. Moreover, the long lifetime makes the following experimental processes of antibubbles more convenient.
Analysis of circumferential CO2 arc welding welded shield machine hob to investigate the welding residual stress fields
Authors: Xue Xiaojie , Chen Jianfu , Huang Shuhua , Zhang Liang , Tian Zhaoping 
Published: August 2024

Abstract
This paper investigates the distribution and formation rules of welding residual stress during the process of shield machine hob welding using CO2 arc welding. A corresponding three-dimensional digital model is created using the FEA software to research the distribution of welding residual stress during the single pass wire filling welding. The numerical model of a shield machine hob is verified by the welding experiments. This study utilizes numerical computational methods to describe the causes and changes of welding residual stress and strain during the welding process. According to the calculations, the results indicate that compressive axial residual stress is observed on the outer surface of the hob body near the weld line. Conversely, tensile axial residual stress is evident on the inner surface in contrast. Additionally, both the outer and inner surfaces of the hob body exhibit tensile hoop residual stress. Near the weld line, the upper surface of the hob ring shows tensile transversal and longitudinal residual stresses. The main reason for this phenomenon is that different plastic strains are generated because of the thermal contracting deformation at the various surfaces and internal stress self-balance. Moreover, the internal residual stress distribution of fillet weld is investigated, which is obviously different from the external of fillet weld.
Preparation of butyl bonded poly (styrene-divinylbenzene) microspheres by Grignard reaction
Authors: Jiang Meijuan , Jin Fuqiang , Zhang Hao , Yi Xiaolu , Zhao Xin 
Published: August 2024

Abstract
The alkylated poly(styrene-divinylbenzene) (PSD) microspheres are attractive chromatographic column packings for high-performance liquid chromatography. In this paper, the butyl bonded PSD microspheres were prepared by the reaction of brominated PSD microspheres with n-butylmagnesium bromide. Fourier transform infrared (FTIR) spectroscopy and solid-state 13C nuclear magnetic resonance (NMR) spectroscopy were used to analyze the polymers. FTIR spectra analysis could establish the occurrence of bromination of PSD microspheres and the reaction of brominated PSD microspheres with n-butylmagnesium bromide. And 13C NMR results illustrated that the Grignard reaction had the largest conversion at the 1-bromobutane adding amount of 0.05 mol according to the analysis of the peak height ratios. The prepared microspheres are expected to serve as chromatographic packing.
Preparation and autocatalytic properties of CNTs/Co3O4/AP Core-shell composite energetic materials
Authors: Li Linpeng , Ba Shuhong 
Published: August 2024

Abstract
To change the thermal decomposition property of AP, band structure/state density of nickel oxide, tricobalt tetraoxide carbon nanotubes, and graphite were emulated by using Materials Studio. The results indicate that the catalytic performance of the indirect gap semiconductor Co3O4 and the indirect gap semiconductor CNTs was excellent, and the band gaps were 0.076 eV and 0.168 eV, respectively. CNTs/Co3O4/AP were made by using the solvent-nonsolvent method. The construction of CNTs/Co3O4/AP composites was analyzed by using XRD and TG-DSC according to the tests. The samples were tested for thermal decomposition performance by using DSC, and the results indicated that the high-temperature temperature of AP significantly decreased by 155.58°C. The above results make clear that the CNTs/Co3O4/AP has good autocatalytic performance.
Strain-rate dependent dynamic constitutive model of tempered glass
Authors: Li Lei , Liu Bangxian , An Erfeng 
Published: August 2024

Abstract
Tempered glass is essentially different from float glass in dynamic mechanical properties, although it is toughened float glass made by physics and they have the same chemical composition. The dynamic mechanical properties of tempered glass are investigated in this paper by using the modified techniques of the Split Hopkinson Pressure Bar (SHPB), and the curves of stress-strain are obtained in various strain rates. Experimental results show that tempered glass is sensitive to strain rates and its dynamic curves of stress-strain are nonlinear. Further study reveals the phenomenon of “pseudo-plastic yield” is completely different from that of ductile materials, and dynamic Young’s modulus and dynamic compressive strength of tempered glass increase with the increasing strain rates. Based on the damage mechanics theory, a kind of constitutive model with damage of tempered glass is given. A strain rate-dependent constitutive model with damage of tempered glass is created by the use of polynomial fitting, according to SHPB experimental results.