bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dawn of nitride ferroelectric semiconductors: from materials to devices
Authors: Wang Ping , Wang Ding , Mondal Shubham , Hu Mingtao , Liu Jiangnan , Mi Zetian 
Published: February 2023

AbstractIII-nitride semiconductors are promising optoelectronic and electronic materials and have been extensively investigated in the past decades. New functionalities, such as ferroelectricity, ferromagnetism, and superconductivity, have been implanted into III-nitrides to expand their capability in next-generation semiconductor and quantum technologies. The recent experimental demonstration of ferroelectricity in nitride materials, including ScAl(Ga)N, boron-substituted AlN, and hexagonal BN, has inspired tremendous research interest. Due to the large remnant polarization, high breakdown field, high Curie temperature, and significantly enhanced piezoelectric, linear and nonlinear optical properties, nitride ferroelectric semiconductors have enabled a wealth of applications in electronic, ferroelectronic, acoustoelectronic, optoelectronic, and quantum devices and systems. In this review, the development of nitride ferroelectric semiconductors from materials to devices is discussed. While expounding on the unique advantages and outstanding achievements of nitride ferroelectrics, the existing challenges and promising prospects have been also discussed.
A practical guide to terahertz imaging using thermal atomic vapour
Authors: Downes Lucy A , Torralbo-Campo Lara , Weatherill Kevin J 
Published: February 2023

Abstract
This tutorial aims to provide details on the underlying principles and methodologies of atom-based terahertz imaging techniques. Terahertz imaging is a growing field of research which can provide complementary information to techniques using other regions of the electromagnetic spectrum. Unlike infrared, visible and ultraviolet radiation, terahertz passes through many everyday materials, such as plastics, cloth and card. Compared with images formed using lower frequencies, terahertz images have superior spatial resolution due to the shorter wavelength, while compared to x-rays and gamma rays, terahertz radiation is non-ionising and safe to use. The tutorial begins with the basic principles of terahertz to optical conversion in alkali atoms before discussing how to construct a model to predict the fluorescent spectra of the atoms, on which the imaging method depends. We discuss the practical aspects of constructing an imaging system, including the subsystem specifications. We then review the typical characteristics of the imaging system including spatial resolution, sensitivity and bandwidth. We conclude with a brief discussion of some potential applications.
Analytical insight into dark matter subhalo boost factors for Sommerfeld-enhanced s- and p-wave γ-ray signals
Authors: Facchinetti Gaétan , Stref Martin , Lacroix Thomas , Lavalle Julien , Pérez-Romero Judit , Maurin David , Sánchez-Conde Miguel A. 
Published: February 2023

Abstract
As searches for thermal and self-annihilating dark matter (DM) intensify, it becomes
crucial to include as many relevant physical processes and ingredients as possible to refine
signal predictions, in particular those which directly relate to the intimate properties of DM. We
investigate the combined impact of DM subhalos and of the (velocity-dependent) Sommerfeld
enhancement of the annihilation cross section. Both features are expected to play an important
role in searches for thermal DM particle candidates with masses around or beyond TeV, or in
scenarios with a light dark sector. We provide a detailed analytical description of the phenomena
at play, and show how they scale with the subhalo masses and the main Sommerfeld parameters. We
derive approximate analytical expressions that can be used to estimate the overall boost factors
resulting from these combined effects, from which the intricate phenomenology can be better
understood. DM subhalos lead to an increase of the Sommerfeld effect by several orders of
magnitude (for both s- and p-wave annihilation processes), especially on resonances, which
makes them critical to get sensible gamma-ray signal predictions for typical targets of different
masses (from dwarf galaxies to galaxy clusters).
Simulations of nonlinear interaction between beta-induced Alfvén eigenmode and tearing mode
Authors: Duan Sizhe , Wang Xiaogang , Cai Huishan , Li Ding 
Published: February 2023

Abstract
The nonlinear interaction between the

m

/

n
=
2

/

1

beta-induced Alfvén eigenmode (BAE) and the

m

/

n
=
2

/

1

tearing mode (TM) observed in the HL-2A experiment is systematically studied with the hybrid kinetic-magnetohydrodynamic code M3D-K. It is found that the nonlinear growth of TM can lead to a gradient buildup on the magnetic island (MI) edge, and then triggers the destabilization of the linearly-stable BAE. Then, the triggered BAE together with TM can produce a significant redistribution of energetic particles. For BAE linearly-dominant-unstable case, the TM activity results in the inward motion of BAE mode structure, and the BAE can have a delay effect on the MI saturation. Furthermore, a high-frequency axisymmetric

m

/

n
=
0

/

0

‘breathing’ mode is generated by the mode coupling of BAE and TM, agreeing well with the experimental observation, and causes the synchronized periodic oscillation of MI width.
Cause Analysis of Economizer Tube Leakage in a Biomass Power Plant
Authors: Fang Lulu , Dai Zhen , Zhao Jifeng , Tao Kangning , Zhang Yiwen , Zeng Yong , Chu Xi 
Published: February 2023

Abstract
Aiming at the leakage of economizer tube in a biomass power plant, the leakage mechanism of economizer tube was studied by means of macro analysis, chemical composition analysis, metallographic structure, micro Vickers hardness test and scanning electron microscope. The results show that there is no misuse of materials or unqualified chemical composition in the leaked economizer tube; The metallographic microstructure is ferrite + pearlite, and the spheroidization level is between 2.0 and 2.5, indicating that there is no obvious spheroidization in the pipe section submitted for inspection; At the same time, the micro Vickers hardness value did not decrease significantly; The outer wall of the pipe is yellowish brown and there is delamination and peeling of attachments. A leakage hole can be seen in the middle of the pipe section, and there is obvious thinning at the edge of the hole, indicating that there is corrosion thinning. The chemical components of the corrosion products are mainly Fe and O, and contain a certain amount of Cl, s, P, Si, K, Ca and other alkali metal elements. Therefore, it can be inferred that the main cause of economizer pipe leakage is corrosion thinning.
Effect of Mixed Firing Ethylene Glycol on Combustion and Emission Performance of Model 4190 Diesel Engine
Authors: Wang Qiwei , Zhang Feifei , Lin Hang , Li Pinfang , Fan Jinyu , Ye Zixiao , Huang Jialiang 
Published: February 2023

Abstract
In order to study the influence of ethylene glycol on the combustion and emission of marine diesel engine, a combustion chamber model was established based on 4190ZLC-2 marine medium speed diesel engine by AVL-FIRE simulation software, and the accuracy of the model was verified. The effects of ethylene glycol on the combustion and emission characteristics of diesel engine under different mixing ratios were studied by simulation experiments, and the optimal mixing ratio of ethylene glycol and diesel was obtained under the premise of ensuring the diesel engine to work at full load. The results show that the average pressure in the cylinder and the maximum burst pressure in the cylinder of the dual-fuel engine mixed with ethylene glycol are decreased compared with the original engine under different mixing ratios. Under full load condition, NOx and soot emissions are decreased by increasing ethylene glycol mixing ratio, and CO emission peak is increased but not significantly increased. Through analysis, it can be concluded that when mixing ratio is 15%, final CO emission decreases by 28.6%, final NO emission decreases by 7.9%, and Soot emission decreases by 16.9%.
Model-based Performance Study of Electrically Assisted Turbocharging Diesel Engine
Authors: Duan Baoyin , Yang Chuanlei , Wang Yinyan , Wang Hechun , Wang Binbin , Hu Deng , Wang Baohua 
Published: February 2023

Abstract
Under the low load conditions, the motor drives the compressor to increase the intake of the engine, and under the high load conditions, the motor recovers the excess exhaust energy, which greatly improves the performance of the diesel engine in all aspects. In this paper, the one-dimensional simulation prediction model of TBD620V16 diesel engine is established and checked. On this basis, the external electric auxiliary turbocharging system of motor is established. The influence of motor power on the performance of diesel engine under different working conditions is studied by simulation, and the control strategy is put forward according to the influence of power and economy of diesel engine under low load. Based on this control strategy, the improvement effect of power performance and economy under low load conditions is studied. The results show that there is an optimal motor power in each load condition to make the comprehensive thermal efficiency of diesel engine reach the maximum value. Under low load condition, with the increase of diesel engine speed, the pressure ratio of electrically assisted turbocharged diesel engine is higher and the fuel consumption is lower. When the diesel engine is accelerated from 25% to 30% load condition, the supercharged pressure of electrically assisted turbocharged diesel engine is stabilized for about 3s, and the supercharged pressure is higher when it is stable, and BSFC is significantly lower than that of traditional turbocharged diesel engine.
Increasing Efficiency and Capacity Expansion and Computer Monitoring Reformation of Aibu III Hydropower Station
Authors: Hu Huali , Yang Hongfeng , Chen Bingsen , Tang Zhengquan , Liu Qibo 
Published: February 2023

Abstract
The main problems and potential safety hazards of Aibu III Hydropower Station after extended service are analyzed. In view of the serious waste of hydraulic resources and low equipment efficiency of the power station, the expansion and reconstruction scheme of hydraulic turbine generator units is proposed, and the supporting design and implementation are carried out from all aspects of power station buildings, electrical engineering, calculation monitoring system, etc., which makes full use of hydraulic resources and completely solves the potential safety hazards of the power station, It has received good social and economic benefits. For the hydropower station after technical transformation, the operator on duty can monitor and control the operation status of main electromechanical equipment such as water turbine generator units, main transformers, transmission lines, high-voltage switches, station power, intake gates, unit main valves, and auxiliary equipment of the power station on the operator workstation in the central control room of the power station.
Study on Castor Oil-based Cationic Waterborne Polyurethane and Its Application
Authors: Kuang Guankun , Liu Yan , Qin Ying , Zhou Yuanyuan , Xin Binjie 
Published: February 2023

Abstract
The raw material for polyurethane synthesis is mainly polyols, while traditional polyols come from fossil resources. With the decrease of fossil resources, the synthesis of polyurethane by vegetable oil-based polyols has gradually gained more attention. Castor oil is a kind of plant oil-based polyols, which are the most suitable plant oil polyols because of its non-toxic, biodegradable and trihydroxy structure. Polyurethane synthesized with castor oil as a polyol has many special properties, such as good antibacterial properties, anti-UV properties, good biocompatibility and biodegradable properties. This paper explores the performance and application of castor oil-based cationic waterbased polyurethane (CWPU), which is helpful to promote its performance research and wider application.
Nanocrystalline-to-amorphous Transformation of Silicon Carbide Induced by Atomic Displacement Events
Authors: Chen Dong , Guo Zhiheng , Zheng Danting , Tian Zihan , Shi Qingyang , Mao Yandong 
Published: February 2023

Abstract
In nanocrystalline silicon carbide (NC-SiC), nanocrystalline-to-amorphous (NC-A) transformation can be induced due to atomic displacement events. To evaluate the detailed mechanisms of radiation resistance to amorphization and understand the role of grain boundaries (GBs), it is significantly critical to determine the amorphized dose of NC-SiC by inducing atomic displacements and obtain the information of defect behaviors in the NC-A transformation by using molecular dynamics methods. The results of this study revealed that full amorphization of NC-SiC was achieved by randomly displace (1) a Si atom or (2) a Si/C atom at the same dose of displacement per atom (dpa). The migration of carbon interstitial is the driving force in the amorphization process of NC-SiC according to the low migration energy of carbon in 3C-SiC. Moreover, defect clusters subsequently form and merge into the amorphous domains at the GBs, which will reveal the microscopic mechanism of the irradiation-induced NC-SiC amorphization.
Application Research of Low-density Polypropylene Materials on Door Trim Panels
Authors: Li Shupeng , Li Bo 
Published: February 2023

Abstract
Lightweight design is an important indicator in the process of automobile development, including product structure design, using plastic instead of steel and low density materials and other technical solution, this paper studies low density material technology to achieve lightweight automotive parts. The material system of polypropylene (PP)/elastomer/talc blends(PP+EPDM-TD)was selected to study the combination of different types of PP (homopolymer PP and random PP) and talc powder (mesh number and content) in the material formula. With the goal of the performance of the door panel parts, PP materials with 5% (PP+EPDM-TD5), 10% (PP+EPDM-TD10) and 20% (PP+EPDM-TD20) talc content were developed to verify the material properties. 10% and 20% talc content can meet the requirements. Then, the two materials were comprehensively evaluated from the aspects of parts forming analysis, size verification and application cost, and the low-density material (PP+EPDM-TD10) was finally selected for application to meet the lightweight design requirements of parts.
Effect of Substrate Temperature on Structure of Vacuum Evaporated Zinc-Magnesium Alloy Coating
Authors: Liu Xin , Qiu Xiaopan , Liu Qiuyuan , Xiong Aiming , Teng Huaxiang , Jiang Guangrui , Zhang Wendong , Jiang Sheming , Zhang Qifu 
Published: February 2023

Abstract
In order to solve the problem that the poor plating ability of Galvanized ultra-high strength steel automobile sheet made by traditional continuous hot-dip galvanizing method and the problem that it is difficult to prepare high magnesium (more than 3%) content coated steel sheet by traditional continuous hot-dip galvanizing method. In this chapter, Zn-Mg coating was evaporated at substrate temperature of 50 °C, 100 °C, 150 °C and 200 °C by double source co-evaporation method, and the microstructure and adhesion of single-layer Zn Mg coating were analyzed. The results show that, with the increasing of substrate temperature, the surface grains of zinc magnesium coating have a trend of increasing gradually, but the adhesion of the coating has a trend of decreasing, among which ZnMg-100 coating has the best adhesion.
A Salt Spray Corrosion Prediction Model for Aviation Aluminum Alloy Based on MVO-GRNN Algorithm
Authors: Wang Zequan , Lv Shengli 
Published: February 2023

Abstract
It is very important to focus on the corrosion failure of aluminum alloy materials for airframe because of the increasing of aircraft service time. However, due to the long corrosion test cycle, the number of samples for processing alloy corrosion related data with high cost is very small. In this paper, a corrosion rate prediction model for less sample data sets is proposed: a General Regression Neural Network which using Multi-Verse Optimizer to optimize prarmeters in order to improve accuracy. In this paper, according to the public data of China Corrosion and Protection Network, the content of Mg, Cu, Fe and other components in different types of aluminum alloys, the corrosion environment (Cl− concentration, pH value) and outdoor exposure time are taken as the input and the mass loss per unit area of aluminum alloys is taken as the output of the model. Moreover, using radial basis function for comparsion. The experimental results show that the model has a good fitting effect for predicting the salt spray corrosion of aviation aluminum alloy, and its performance is better than the traditional RBFnetwork.
Method and Mechanism for Adhesion Recovery of Laser-Treated Aluminum Surface Exposed to Hygrothermal Environment
Authors: Li Shuangshuang , Lin Jianping 
Published: February 2023

Abstract
Laser treatment is used to improve the surface adhesion performance of metal materials, including aluminum alloy. However, the adhesion performance of laser-treated aluminum alloy is reduced after the hygrothermal exposure during storage before bonding, obtaining the reliable surface adhesion is a challenge. In this paper, the nanosecond laser-treated aluminum alloy was exposed in a hygrothermal environment with 80°C 95%R.H. for 48h. Scanning electron microscopy, transmission electron microscopy and adhesion strength testing were used to characterize the physical/chemical properties and adhesion reduction of the aluminum surface. Subsequently, a simple and effective method of heat treatment was proposed to recover the adhesion strength. Finally, molecular dynamics (MD) simulation was utilized to explore the underlying recover mechanism. The experimental results revealed a AlOOH layer with ~410 nm thickness was generated on the laser-treated aluminum surface after hygrothermal exposure, which reduced the adhesion strength by 38% (from 30.9MPa to 18.9MPa). After heating at 120 °C for 24 hours, the adhesion strength (30.4MPa) of aluminum surface recovered to the level before hygrothermal exposure. MD results suggested that there are two mechanisms for the adhesion recovery by heat treatment: 1) the atomic kinetic energy of AlOOH increased and the structural order decreased, which strengthened its electrostatic and hydrogen bond interactions with adhesive molecules; 2) the mechanical property of AlOOH were enhanced.
Parameters Identification of Blade Multi-mode Coupled Vibration Based on Blade Tip Timing
Authors: Zhi Fengyao , Duan Fajie , Li Jie , Niu Guangyue , Zhou Qi 
Published: February 2023

Abstract
Health monitoring is crucial for the safe operation of rotating machinery. As an effective technique for measuring the vibration of rotating blades, blade tip timing (BTT) is widely used since its advantages of non-contact and low intervention. During the operation of high-speed blades, the multi-mode coupled synchronous vibration will occur. However, the existing BTT-based methods cannot identify the multi-mode coupled vibration parameters. To solve the problem, a multi-mode coupled vibration model of the blade based on a slender cantilever beam is established, and the contribution of each mode to the blade vibration response is considered. A new Circumferential Fourier Fit (CFF) method for parameters identification of blade multi-mode coupled synchronous vibration is proposed. According to the proposed method, the reconstruction of multi-mode coupled synchronous vibration signals can be realized. Finally, the accuracy of the proposed method is verified by simulation data.
Optimization of Key Hinge Points Position of Folding Arm Ascending Platform Fire Truck
Authors: Wang Zhaojie , Liu Tao , Guo Tong 
Published: February 2023

Abstract
In modern society, high-rise buildings are everywhere, and urban fire protection is also facing many challenges. The primary problem is the fire protection and rescue of high-rise buildings. Therefore, there is always a demand for large ascending platform fire trucks in China. Collapsible boom structure is a common structure of fire truck with ascending platform. The performance of collapsible boom luffing process largely depends on the layout of each hinge point of luffing mechanism. In this paper, the hinge point position of the key structure of the folding arm type 72m ascending platform fire truck is optimized, and the original structure layout is improved, so that the variable amplitude hydraulic cylinder has less force, and the safety performance of the folding arm is improved. In this paper, the kinematic and dynamic models of boom amplitude are established, and two optimization methods, genetic algorithm and SQP algorithm, are adopted to optimize, and the two optimization results have a certain degree of improvement in performance compared with the original layout.
Establishment of Mathematical Model of Different Burr Removal Methods for Automobile Valve Body Parts
Authors: Zhang Chundong 
Published: February 2023

Abstract
In the process of auto body parts processing, machining surface at the junction will produce burrs or flares. The existence of burr will have a bad effect on the machining accuracy, assembly accuracy and appearance quality of parts. In industrial production, the cost of removing these burrs is enormous. In automotive parts, the cost of deburring body parts can account for machining costs15% - 20%. Industry practice has shown that the actual cost of deburring systems increases as the complexity and accuracy of parts increase. Precision parts such as automobile valve body require high precision, and burr is usually removed by grinding. In grinding process, different types of burr will adopt different grinding process to purify, frequent adjustment process will affect the production efficiency, so the combination with the characteristics of grinding, the grinding grain edge radius, equivalent negative rake Angle and other factors into consideration, burr types can be divided into three categories, respectively on the three types of burr mathematical modeling, The removal mechanism of different kinds of burr is explained theoretically, which lays a theoretical foundation for improving efficiency in production practice.
Modeling and Analysis of Vertical Angle Fine-tuning Mechanism Based on Bridge-type Mechanism
Authors: Jiang Bo , Zhang Zijie , Zhou Shun , Chu Yuanbo , Guo Yifan 
Published: February 2023

Abstract
To solve the problem of Angle fine-tuning in the vertical direction of optical devices, we propose an Angle fine-tuning mechanism based on Bridge-type Mechanism. In this paper, we use the method of compliance matrix to establish the statics model of the mechanism and calculate the influence of each parameter on the magnification of the model, then verify it by finite element simulation. Meanwhile, we deduce the calculation formula of compensation value by simulation value and theoretical value to establish Theoretical equations of motion for this mechanism. The results indicate that the simulation results agree well with the theoretical calculation results, after introducing the compensation value, the error caused by the amplification loss of the mechanism can be compensated well to ensure the accuracy of the derived formula.