bluuebunny/crossref_metadata_2025_split huggingface dataset:
Phase transition for the Ising model with mixed spins on a Cayley tree
Authors: Akin Hasan , Mukhamedov Farrukh 
Published: May 2022

Abstract
In the present paper, we consider the Ising model with mixed spin- (1, 1/2) on the second order Cayley tree. For this model, a construction of splitting Gibbs measures is given that allows us to establish the existence of the phase transition (non-uniqueness of Gibbs measures). We point out that, in the phase transition region, the considered model exhibits three translation-invariant Gibbs measures in the ferromagnetic and anti-ferromagnetic regimes, respectively, while the classical Ising model does not possess such Gibbs measures in the anti-ferromagnetic setting. It turns out, that like the classical Ising model, we can find a disordered Gibbs measure, therefore, its non-extremity and extremity are investigated by means of tree-indexed Markov chains.
Research on consistency control of angular velocity of UAV swarm
Authors: Pang Qiangwei , Chen Ye , Wu Zhonghong , Zhu Yongyong , Li Zongji 
Published: May 2022

Abstract
In order to keep the angular velocity output of unmanned aerial vehicle (UAV) swarm consistent, a solution is proposed in this paper. Firstly, a reasonable simplified modeling is carried out for UAV, and its linear part is selected to set the output consistency controller. Then, based on graph theory and lyapunov stability theorem, the asymptotic stability conditions of the designed controller are given. Finally, the effectiveness of the proposed method is verified by simulation. The results show that the designed controller can quickly keep the output angular velocity of UAV swarm consistent.
Comparative study of 3D object detection frameworks based on LiDAR data and sensor fusion techniques
Authors: Venugopala Sreenivasa Hikkal 
Published: May 2022

Abstract
Estimating and understanding the surroundings of the vehicle precisely forms the basic and crucial step for the autonomous vehicle. The perception system plays a significant role in providing an accurate interpretation of a vehicle’s environment in real-time. Generally, the perception system involves various subsystems such as localization, obstacle (static and dynamic) detection, and avoidance, mapping systems, and others. For perceiving the environment, these vehicles will be equipped with various exteroceptive (both passive and active) sensors in particular cameras, Radars, LiDARs, and others. These systems are equipped with deep learning techniques that transform the huge amount of data from the sensors into semantic information on which the object detection and localization tasks are performed. For numerous driving tasks, to provide accurate results, the location and depth information of a particular object is necessary. 3D object detection methods, by utilizing the additional pose data from the sensors such as LiDARs, stereo cameras, provides information on the size and location of the object. Based on recent research, 3D object detection frameworks performing object detection and localization on LiDAR data and sensor fusion techniques show significant improvement in their performance. In this work, a comparative study of the effect of using LiDAR data for object detection frameworks and the performance improvement seen by using sensor fusion techniques are performed. Along with discussing various state-of-the-art methods in both the cases, performing experimental analysis, and providing future research directions.
Simulation design of reliability improvement of metal hose for rocket engine
Authors: Kun Chen Chong , Yan Liu , Jun Wang Zhao , Fang Zhao Ji , Meng Wang 
Published: May 2022

Abstract
Facing the new challenges of high-density space launches in the later period, this paper studies the numerical simulation of the metal hose used in the new generation of launch vehicle models to improve the reliability of the metal hose. Through the calculation of bellows with different elements, it is found that the calculation results of shell element and solid element are similar, and the calculation efficiency of shell element is much higher than that of solid element. Finally, it is established that the SHELL181 is used for the finite element calculation of the bellows. Based on the stiffness equivalent theory, an equivalent model of the net sleeve with strands as the unit is established. Through the verification of finite element and experiment, this equivalent model can better simulate the linear stage of metal mesh sleeve under tension. Finally, the modeling method of metal hose simulation design is established.
Microstructure and properties of Cu-Cr-Ti alloy with high softening resistance
Authors: Yang Zhen , Wang Wanyu , Ma Jimiao , Liu Xingyu , Liu Feng 
Published: May 2022

Abstract
Cu-Cr alloys with excellent mechanical and electrical properties have been used in many industrial fields. However, the weak heat resistance of Cu-Cr alloys is a considerable shortness. In this work, Cu-Cr-Ti alloy was fabricated by vacuum melting and plastic deformation. Mechanical property and electrical conductivity of Cu-Cr-Ti alloy were investigated after aging treatment. The results show that peak aging occurs when aging at 450 °C for 1 hour. The mechanism of performance changes are discussed. The softening temperature could be identified as 575 °C, according to percentage of hardness changes of peak-aged Cu-Cr-Ti alloy annealed at different temperature and time. The microstructure explained that the addition of Ti, which retards recrystallization, could enhance the softening resistance of Cu-Cr alloy.
Sample preparation and research of amorphous composite material for transmission electron microscope
Authors: Zhu Y. J. , Jiang R. , Zhang Z. W. , Zhao J. , Chen Y. , Li Y. L. , Ding B. Y. 
Published: May 2022

Abstract
The two preparation methods of amorphous composite TEM samples, electrolytic double spray thinning and ion thinning, are studied. In addition, an improved ion thinning method is used to successfully prepare a metastable brittle amorphous composite TEM sample. The TEM sample prepared by the ion thinning method has a large thin area near the interfaces in composites, which lays a solid foundation for further research on the interface principle of composite materials, and also provides reliable data support for optimizing the preparation process of the composite materials.
Performance analysis of FeCoCr1.5NiAl high-entropy alloy coating on H13 steel by laser cladding
Authors: Gao Y. L. , Kou G. P. 
Published: May 2022

Abstract
For a better performance of the high wear resistance of H13 die steel, FeCoCr1.5NiAl High Entropy Alloy coating was prepared on H13 by laser cladding. The results show that the HEA coating has good metallurgical bonding with matrix. The microstructure of coating is columnar crystal and equiaxed crystal. The coating has the single-phase body-centered cubic and face-centered cubic. The microhardness of this coating is up to 800HV, about 4 times that of the matrix. The friction coefficient of coating is smaller than matrix and the wear volume of coating is decreased approximately 61.02% compared with matrix. The main wear forms of coating is abrasive wear and wear forms of matrix is abrasive wear and fatigue wear.
In vitro hydrolytic degradation properties of poly(D, L-lactic acid) / poly(L-lactide-co-ε-caprolactone) blend films
Authors: Deng Dongwen , Li Mingxi , Li Fengqin , Wu Gensheng , Zhang Yi , Ni Zhonghua , Zhao Gutian 
Published: May 2022

Abstract
Biodegradable materials are widely used in biomedical application. Blending polymers have become a promising strategy to regulate degradation rate and expand material properties. In this study, the poly(D, L-lactic acid) (PDLLA) and polyCL-lactide-co-ɛ-caprolactone) (PLcCL) blend films with different ratios were prepared by the ultrasonic spray technology and the in vitro hydrolytic degradation tests of these films were then carried out in phosphate buffered saline with 37°C and 50°C. The in vitro degradation of the blend films were investigated via mass loss, gel permeation chromatography (GPC), scanning electron microscopy (SEM). It was found that the blended film had good miscibility and uniformity through SEM tests. Besides, the 50/50 PLcCL/PDLLA film showed the slowest degradation rate at 37°C, while at 50°C, the 100 PLcCL film had the slowest degradation. This work can provide helpful suggestions for the evaluation of biodegradable polymer coating materials in degradable polymer coated stent.
Production of highly dispersed powders of metal-oxides by evaporation-condensation technique when heated by focused radiation of terahertz-range gyrotron setup
Authors: Tsvetkov Alexander , Vodopyanov Alexander , Mansfeld Dmitry , Orlovskiy Alexey , Kamenskiy Maxim , Samokhin Andrey , Alexeev Nikolay , Sinayskiy Mikhail , Sedov Anton 
Published: May 2022

Abstract
The paper describes the experimental setup and some results of experiments on the production of highly dispersed metal oxides powders using the example of tungsten trioxide WO3 by the evaporation-condensation method when the initial material is heated by focused radiation of 0.53 THz / 240 W gyrotron. By focusing the gyrotron radiation, it was possible to achieve an intensity of several kW/cm2 on the surface of the evaporated initial sample. The use of a system with a rotating crucible made it possible to increase the evaporation rate of the substance by 3–4 times, which is very important in conditions of a lack of power.
IGBT Energy Losses Analysis and Heat Dissipation System Design of Three-level Inverter
Authors: Qi Liang , Wang Xu , Pan Jiake 
Published: May 2022

Abstract
According to the needs of the design and development of three-level inverter, the paper introduces the design process of the inverter cooling system in detail. Firstly, this paper proposes a calculation method of the energy losses in the insulated gate bipolar transistor(IGBT) and freewheeling diode(FWD), and calculates the energy losses of the IGBT module in the inverter according to the method. Otherwise, a set of the inverter forced air cooling heat dissipation system is designed, and the simulation of the finite element analysis is used for the analysis and optimization of the system. Finally, the test shows that the temperature rise of the IGBT module is within the reasonable range, which verifies the availability and feasibility of the proposed method and the designed system.
Design of power measurement vector analysis tool
Authors: Zhang Shuo , Yi Yongfei , Sun Mengxin , Liu Jinsong , Liu Yang 
Published: May 2022

Abstract
At present, in terms of power marketing measurement training, there are problems such as measurement wiring discrimination inconvenience, drawing inconvenience, wiring display time consuming, resulting in the measurement wiring training is not in place. The article first of the three phase three line power meter and three phase four line power meter correct wiring mode and phasor diagram, and then a special tool for the vector analysis used in the training is designed, which can not only solve the above problems, but also replace the manual drawing of the vector map, which has a good practical effect on the power marketing measurement training, enables the students to learn the measurement wiring more intuitively.
A novel model to identify the performance of power cable on the offshore network by considering dynamic environmental impact
Authors: You Fei , Abdul Talib Mat Yusoh Mohd 
Published: May 2022

Abstract
Shore power cable is an important power equipment for ship-shore interactive transmission. The insulation aging speed of shore power cable is faster than that of ordinary cable, and the application life of the shore power cable is relatively short. Therefore, this paper is based on multi physical field coupling on the shore power cable under special conditions incorporating all environment impact, to analyze the impact of solar radiation on the temperature distribution of multi-loop shore power cable, and to propose a novel technique to calculate realtime ampacity of shore power cable based on the heat balanced equation, so a novel model to identify the performance of power cable on the offshore network by considering dynamic environmental impact is established.
Short-circuit fault evaluation of SF6 circuit breaker energy storage motor coil based on high-frequency equivalent model
Authors: Qian Shuaiwei , Wang Lu , Peng Yanjun , Huang Yongqiang , Sun Chunshu , Jiang Wei , Zhou Xiong 
Published: May 2022

Abstract
The capacitive inductance parameters of the energy storage motor windings were calculated by finite element method, and the high-frequency equivalent model of the winding was established based on ATP-EMTP. Square wave pulse voltage signal was applied to the input end of the model, and the response voltage curve at the end of the circuit model was measured. The wavelet packet-energy spectrum was calculated as the characteristic parameter of the response curve in different short-circuit positions, and the short-circuit position was evaluated by the random forest algorithm. The accuracy rate of short-circuit fault location in the test set was 75%, indicating that the method has certain feasibility.
Mathematical Model and Performance Analysis of Aluminum Tube Collector
Authors: Yan Xiao , Zhang XiaoMing , Wei YiLi 
Published: May 2022

Abstract
Aluminum tube collector is a new type of collector that can be popularized, which can absorb solar energy and air energy at the same time. By analyzing the heat transfer process of aluminum tube collector, its mathematical model is established, and iterative calculation is carried out in Visual Basic to obtain the relationship between collector efficiency and different parameters. Finally, it is concluded that the thermal efficiency of aluminum tube collector is about 1.5, which is much higher than that of traditional collector; In sunny days with high ambient temperature, aluminum tube collectors are preferred; When the fin width is about 28mm, the mass flow is 0.20kg/s-0.25kg/s, and the inlet temperature of the working medium of the collector is about 5-10°C lower than the ambient temperature, the performance of the collector is better.
Construction and implementation of power grid dispatching interactive system based on Internet
Authors: Qi Xuesong , Tian Li , Sun Jia , Li Mengqi 
Published: May 2022

Abstract
The construction of the information-based and intelligent platform can completely reform the management mode of enterprises, effectively improve the production efficiency and competitive strength of enterprises. In view of the importance of information and intelligence construction, domestic electric power enterprises continuously build and transform information platform based on their own business needs. In this paper, starting from the background of the construction of the Power Grid Dispatching Command Network Interactive System, the dispatching standard and the overall idea of systems engineering, the interactive mode and system structure scheme of the power grid dispatching command network based on the national and industry standards are proposed, based on the computer network, the interactive supporting mode of dispatching command network is constructed to form a comprehensive and efficient dispatching command network, which ensures the flexibility and reliability of dispatching command interaction and improves the level of dispatching command.
Stability analysis and Simulation of power system based on Matlab
Authors: Wu Junda , Jing Gao , Yi Zhao 
Published: May 2022

Abstract
Abstact: The stability analysis of power system is an important process to measure the security and stability level of the power system and the construction and development plan. The stability of the power system is divided into static stability, transient stability and dynamic stability. The stability of the system is judged by different analysis methods for different forms and sizes of interference. The construction of large power grid is developing rapidly, and the powerful computing function of Matlab can adapt to the more and more huge power system stability calculation tasks. As a Matlab sub module, Simulink can properly assist the stability calculation of power system with its powerful and stable computing function and simple visual modular graphics.
In this paper, the concept of power system stability is first proposed, the static stability and transient stability of power system are briefly introduced. Secondly, the static / transient stability of power system is simulated with Simulink, and the measures to improve the static / transient stability of power system are proposed.
Power Monitoring System Based on 4G Network Wireless Transmission
Authors: Liu Xiaohong , Li Donghua , Xun Sichao , Zhang Guomin , Xu Feng , Zhao Yiyi 
Published: May 2022

Abstract
In order to solve the problems faced by high-voltage power facilities in the monitoring process, after comprehensively considering the characteristics of high-voltage transmission lines, regional environment, and other factors, a data monitoring system based on the perception layer of the Internet of Things is established. The system uses advanced IoT(Internet of Things) sensing technology, networking technology, and transmission technology to network data sub-nodes such as tower settlement, line galloping, and meteorology for information transmission. After the transmitted sensor information is fused and further processed, the overall judgment and early warning of the disaster area are formed.
The JUNO experiment and its electronics readout system
Authors: Petitjean P.-A. , Clerbaux B. , Collomer Molla M. , Yang Y. 
Published: May 2022

Abstract
The main goal of the Jiangmen Underground Neutrino Observatory (JUNO) under construction in China is to determine the neutrino mass hierarchy and to measure oscillation parameters to the sub-percent level. The detector consists of 20 ktons of liquid scintillator instrumented by 17612 20-inch photo-multiplier tubes, and 25600 3-inch small PMTs, with photo-cathode coverage of 77%. The electronics system is separated into two main parts. The front-end system, sitting under water, performs analog signal processing. The back-end electronics system, sitting outside water, consists of the DAQ and the trigger. The current production status of the experiment as well as the design of the electronics system will be reported in the presentation.
BBM92 quantum key distribution over a free space dusty channel of 200 meters
Authors: Mishra Sarika , Biswas Ayan , Patil Satyajeet , Chandravanshi Pooja , Mongia Vardaan , Sharma Tanya , Rani Anju , Prabhakar Shashi , Ramachandran S , Singh Ravindra P 
Published: May 2022

Abstract
Free-space quantum communication assumes importance as it is a precursor for satellite-based quantum communication needed for secure key distribution over longer distances. Prepare and measure quantum key distribution (QKD) protocols like BB84 consider the satellite as a trusted device, which is fraught with security threat looking at the current trend for satellite-based optical communication. Therefore, entanglement-based protocols must be preferred, so that one can consider the satellite as an untrusted device. The current work reports the effect of atmospheric aerosols on the key rate obtained with BBM92 QKD protocol, an entanglement-based QKD protocol over 200 m distance, using an indigenous facility developed at Physical Research Laboratory (PRL), Ahmedabad, India. Our results show that concentration and extinction coefficient of atmospheric aerosols play a major role in influencing the observed sift key rate, and eventually, the secure key rate. Such experiments are important to validate the models to account for the atmospheric effects on the key rates achieved through satellite-based QKD.
Comparative study of green synthesised sulphur nanoparticles in different acidic media
Authors: Himanshi  , Joshi Deepika P 
Published: May 2022

Abstract
Sulphur nanoparticles (SNPs) are of great importance, due to their tremendous use in agriculture and industries. In the present work, a comparative study has been conducted to find the most suitable combination to produce desired sulphur nanoparticles, using different acidic mediums along with different green surfactants. An eco-friendly and benign method has been discussed here for the synthesis of SNPs using two different acidic mediums (citric acid and oxalic acid). Catharanthus roseus and Aloevera plant extracts have been taken as stabilising and capping agents in the process. A series of characterisation techniques have been carried out such as scanning electron microscopy (SEM), x-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FTIR) and UV–vis for morphological, structural and optical study. UV–vis absorption spectra have shown that the absorption peak is in the range of 287−296 nm for all the synthesised nanoparticles and confirm the formation of SNPs. XRD data has revealed the crystalline nature of SNPs and the smallest crystalline size of 69 nm for oxalic acid with Aloevera leaf extract. It has been observed that the size reduces due to the bonding/ adsorption of biomolecules at the surface of SNPs. Aloevera leaf extract gives the maximum adsorption as conveyed by the FTIR graph. The morphology and uniformity of SNPs are observed using the scanning electron microscope. SNPs synthesised using citric acid as a reducing agent have been found spherical in shape while the ones synthesised using oxalic acid are hexagonal. The study reveals that the SNPs synthesised using Aloevera and oxalic acid are more uniform and monodispersed.
Light emission properties of mechanical exfoliation induced extended defects in hexagonal boron nitride flakes
Authors: Ciampalini G , Blaga C V , Tappy N , Pezzini S , Watanabe K , Taniguchi T , Bianco F , Roddaro S , Fontcuberta I Morral A , Fabbri F 
Published: May 2022

Abstract
Recently, hexagonal boron nitride (hBN) has become an interesting platform for quantum optics due to its peculiar defect-related luminescence properties. Concomitantly, hBN was established as the ideal insulating support for realizing 2D materials devices, where, on the contrary, defects can affect the device performance. In this work, we study the light emission properties of hBN flakes obtained by mechanical exfoliation with particular focus on extended defects generated in the process. In particular, we tackle different issues related to the light emission in hBN flakes of different thicknesses in the range of hundreds of nanometers, revealing a higher concentration of deep level emission in thinner area of the flake. We recognize the effect of crystal deformation in some areas of the flake with an important blue-shift (130 meV) of the room temperature near band edge emission of hBN and the concurrent presence of a novel emission at 2.36 eV, related to the formation of array of dislocations. We studied the light emission properties by means of cathodoluminescence (CL) and sub-bandgap excitation photoluminescence of thickness steps with different crystallographic orientations, revealing the presence of different concentration of radiative centers. CL mapping allows to detect buried thickness steps, invisible to the scanning electron microscopy and atomic force microscopy morphological analysis.