bluuebunny/crossref_metadata_2025_split huggingface dataset:
Method and Experiment Study of the Array Shape Calibration for Underwater Vertical Line Arrays
Authors: Li Xuegang , Wu Shuyou , Su Shengli , Ding Lan , Jiang Guoqing 
Published: March 2023

Abstract
Vertical line arrays have been widely used in underwater target location and noise measurement, and the attitude and shape of the vertical array have a significant influence on detection accuracy. The paper presents an array shape calibration method for underwater vertical acoustic array-based measurement systems. Firstly, a standard acoustic source was used to transmit underwater acoustic signals at a certain distance from the acoustic array, and the target location based on the received data of the acoustic array was estimated concerning distance and depth to obtain the two-dimensional ambiguity function of the depth and distance of the array. Then, the ambiguity function was used to calculate the center depth and the inclination angle of the vertical acoustic array and to further obtain the shape and location information of the acoustic array. Finally, a lake experiment study was carried out. The results showed that the calibrated array shape was in good agreement with the actual location, and the sound source location estimated by using the calibrated array shape was consistent with the actual sound source location, thereby effectively reducing the impact on the measurement accuracy due to the inclination of the measurement system under the influence of water current.
Sound Quality Improvement of Dynamic Loudspeaker by Material Selection of Diaphragm
Authors: Dong Gengyue 
Published: March 2023

Abstract
In terms of sound quality, mechanical stability, and cost, the moving coil speaker is exceptional to the moving iron and electrostatic speaker. The diaphragm in the speaker is crucial in reproducing the sound wave from the electrical signal input. The materials of the diaphragm should be both rigid and lightweight. However, there are few quantitative studies on the selection of diaphragm materials. Connecting the equation of mass and the deflection of a circular plate yields a performance index that maximizes Young’s Modulus and minimizes the density. A line graph in logarithmic can be generated from the index to select materials from various categories in the Ashby plot provided by the Granta CES Edupack software. The chosen materials would be simulated in COMSOL and their sound pressure level plots would be analyzed based on the numerical solution. The Ashby plot and the numerical solutions by COMSOL have indicated that paper is the best material among the selected materials with the most stable frequency response in the mid-range frequency range, a high-performance index, and a low price per unit volume.
Analysis of 5 MW Blade Two-Way Fluid-Structure Interaction Characteristics
Authors: Lin Xihan , Liu Jiang , Jiang Weiting , Fu Zaiguo 
Published: March 2023

Abstract
A CFD-CSD coupled method was employed to establish an aeroelastic model of the NREL 5 MW wind turbine. The two-way fluid-structure interaction (FSI) simulation was carried out for this aeroelastic model. The response curves of blade tip flapwise, edgewise, and torsional deformation under normal operating conditions was obtained. The results show that the blade deformation shows a trend of increasing and then decreasing from the cut-in wind speed to the cut-out wind speed with the rise in wind speed. The maximum deformation appears in the vicinity of rated working conditions. Furthermore, the difference in aerodynamic performance between two-way FSI and one-way FSI has been studied to reveal the influence of the aeroelastic effect on performance. The two-way FSI that considers the blade deformation causes significant periodic fluctuations in the torque and thrust curves, with a maximum deviation of 3.75% in the average torque at 20 m/s. Therefore, the two-way FSI that introduces the aeroelastic effect can predict the aerodynamic performance more accurately.
Study on the Tribological Properties of Polymer Interface and the Mapping Mechanism of Friction Noise in a Wide Temperature Range
Authors: Cheng Ganlin , Guo Fei , Jia Xiaohong 
Published: March 2023

Abstract
In order to study the tribological properties and frictional noise mapping mechanism of polymer interface at a wide temperature range, tribological and frictional noise acquisition tests were carried out on a Ball-on-Three-Plates Tribology Accessory. The friction coefficient and noise signal data sets were collected for 15 minutes from the friction surfaces of polytetrafluoroethylene and 0Cr18Ni9 austenitic steel pairs at six temperatures and three constant loading-speed contact points in a wide temperature range of -150°C-25°C. The wear rate of the polymer was measured and the wear state of the polymer interface was studied by field emission environmental scanning electron microscopy (SEM). Based on the analysis of the time-frequency domain characteristics of friction noise and the qualitative mapping relationship between the wide-temperature domain tribological properties and friction noise, the theoretical and experimental basis is provided for establishing online early warning monitoring of the tribological performance of polymer-metal friction pairs based on the time-frequency domain characteristics of friction noise.
Effects of structural elasticity on the flow-induced cavity tone in water
Authors: Zhang Wenwen 
Published: March 2023

Abstract
Measurement of the flow-induced tones of cavities with three different structural elasticity was conducted in the water tunnel. The frequency and amplitude of the cavity tones varied with the water flow velocity are present and discussed. In addition, the modal jump phenomenon of flow-induced cavities for both elastic cavities and rigid cavities is compared and discussed. The influence law of structural elasticity on the characteristics of flow-induced tones in water cavities in the amplitude-frequency domain is analyzed.
Numerical Simulation for Nonlinear Interaction between an Attached Air Bubble and Nearby Oscillating Bubble
Authors: Jiang Mingzuo , Wang Jiaxia 
Published: March 2023

Abstract
The numerical simulations of a non-spherical evolution of pulsating bubble interacting with a stationary air bubble attached to a fixed structure were performed by using the three-dimensional boundary integral method which is based on the mirror image method to simplify the processing of the numerical model. Validation of the code is presented by comparison of numerical predictions with laboratory experimental data obtained by our previous research. Complex phenomena are observed such as three kinds of bubble jet forms: upward bubble jet, bubble splitting phenomenon, and downward bubble jet. The present simulations provide insight into the interesting bubble jetting phenomena in detail, including bubble splitting, jet away from the plate, and bubble shedding.
Numerical Simulation of Particle Filtration by Rectangular Fibres within a Parallel and Staggered Array
Authors: Yue Shixian 
Published: March 2023

Abstract
In this research, two-dimensional numerical simulation is used to examine the filtration performance of rectangular fiber filters. Ansys Fluent is employed to obtain the stable flow field distribution and the DPM model is used to calculate the particle trajectories in the flow field. The effect of pertinent factors such as fiber arrangement, particle-to-fiber diameter ratio, and Stokes number on the performance of rectangular fiber filters are analyzed. The simulation results indicate that both the parallel and staggered arrays of rectangular fibers have a significant influence on the capture efficiency and pressure drop. At the same flow velocity, the pressure drop of the fibers with a parallel array is lower than that of the staggered array fiber model. The capture efficiency of the staggered array model and the parallel array model increases with the increase of the ratio of particle to fiber diameter and the Stokes number. When the interception and inertial impaction mechanisms domiant, the filter with a staggered fiber array structure performs batter than the parallel array in terms of capture efficiency. The research results can provide a theoretical basis for the structure optimization and design of the air filter with multi-layer fiber.
Semi-supervised Learning Method for Source Range Estimation in Shallow Water
Authors: Li Lebo , Gong Fusheng , Liu Shijing 
Published: March 2023

Abstract
Data-driven machine learning methods in recent years have shown great vitality in underwater acoustic, especially in the localization of underwater sound sources. Meanwhile, there exists a great difficulty in the acquisition and processing of underwater acoustic data, which caused the lack of label data. This paper proposes a two-step semi-supervised learning-based range estimation method for shallow ocean sound sources, which utilizes semi-supervised learning in deep learning to alleviate the problem of limited access to underwater acoustic label data and relatively abundant unlabelled data in practical scenarios. The performance of the method has been validated on SWellEx-96 experiment data.
Study on the Self-Pressurization Laws of Cryogenic Liquid Krypton Tank for the Electric Propulsion System
Authors: Chen Ji Dong , Zhu Jian Bing , Zhao Ji Peng , Gu Sen Dong , Yu Bin , Yuan Yu Qi 
Published: March 2023

Abstract
To meet the application requirements of zero boil-off storage of cryogenic liquid krypton propellant in the process of completing deep space exploration missions by electric propulsion system, it is important to study the thermodynamic changes in cryogenic liquid krypton tanks under different environments. The gas phase and liquid phase material model of krypton working fluid, the gas-liquid phase change model at the interface layers, and the heat transfer process between the wall and the internal fluid are established by ANSYS-Fluent. The energy source term, gas phase, liquid phase mass source term, and phase change saturation temperature in the liquid krypton cryogenic tank are defined. This paper’s three influencing factors of gravity, initial liquid filling rate, and wall heat leakage are simulated and analysed. The results show that: (1) The self-pressurization rate significantly rises as the wall heat flux rises, and the gas-liquid interface drops less quickly. The pressure and temperature in the tank are also increasing at the same liquid level. (2) In the normal gravity environment, the bigger the filling rate, the lower the corresponding self-pressurization rate. (3) In the process of variable gravity, the gas pressurization rate in the cryogenic liquid krypton tank falls with the decrease of gravity.
Numerical Calculation of Hydrodynamic Characteristics of Individuals in Coral Nurseries
Authors: Liu Can , Dong Zhiyong , Pan Yun 
Published: March 2023

Abstract
Coral nurseries play a critical role in solving the technical and ecological problems that hinder the large-scale and long-term culture of coral populations, which has become an effective tool for the coral culture and the restoration of coral reefs. We need to conduct a profound study of the hydrodynamic characteristics of individuals in coral nurseries to ensure that the coral nurseries achieve long-term, industrialized, and batch coral cultivation. In this paper, the calcified coral skeletons of Acropora cervicornis are selected, followed by refined statistical analysis of the characteristic dimensions of individual corals to calculate the average density, and fitted equations for the horizontal projected area and volume. In addition, we also analyze the force of the individual coral, which lays a foundation for studying the hydrodynamic characteristics of corals under wave action.
First-Principles Calculations of Elasticity Properties of AgW20 Alloy
Authors: Liu Jide , Du Xiaoming , Wang Xue , Xie Ming , Li Jinguo , Zhao Shangqiang , Zhou Yizhou , Zhang Qiao , Fang Jiheng 
Published: March 2023

Abstract
In this paper, the first-principles calculations based on DFT were employd to investigate the elasticity characteristics of AgW20 alloy. The elasticity constants of the single crystals are calculated using the finite strain method and Voigt – Reuss – Hill (VRH) approach. The universal anisortropic index (AU
), shear anisortropic index, orientation dependency of Young’s modulus, bulk modulus were used to characterize elasticity anisortropy behaviors. The calculated elasticity properties of AgW20 alloy show a remarkable elasticity anisortropy for AgW20 alloy.
Study on Interfacial Effects on Thermal, Mechanical and Fluorescent Properties for SrTiO3-SrCeO3 Composites
Authors: Qu Liu , Wan Rui , Zhao Yanjie , Wang Yu 
Published: March 2023

Abstract
Combining different phases in composite materials introduces interfaces that control the microstructure as well as functional and structural properties. This work focused on designing thermodynamically compatible SrTiO3-SrCeO3 with low thermal conductivity and up-conversion photoluminescence. Using a one-pot solid-state reaction method, SrTiO3-SrCeO3 composites have been synthesized with high-temperature stability, low thermal conductivity, and ideal mechanical and photoluminescence properties. Due to the interfaces between cubic and orthorhombic structures that could enhance the phonon scattering, the thermal conductivity was significantly decreased, while the hardness was maintained and satisfied by the mixing law. The photoluminescence of SrTiO3-SrCeO3 exhibited green, blue and purple bands with an up-conversion fluorescence at room temperature.
Study on the Hydrogen Precipitation Performance of Nanofiber Aerogel-based Platinum-carbon Catalysts
Authors: Yu Haidan , Liu Yitao 
Published: March 2023

Abstract
Clean energy development is particularly important in the context of increasing environmental pollution caused by fossil energy consumption. In this paper, a carbon aerogel-loaded platinum (Pt/CNF As) catalyst prepared by freeze-drying and combined with sodium borohydride reduction can be used in a hydrogen evolution reaction (HER) to produce the most promising clean energy source and hydrogen energy. The plastic deformation is only 16% after 1000 compression cycles at 50% strain. In addition, compared with commercial Pt/C catalysts, Pt/CNF As eliminates the complicated process of working electrode preparation without reducing electrocatalytic activity and has an overpotential of only 40 mV (10 m A/cm2) and an active area of 124 mF/cm2.
Study on the Bearing Capacity of Stringer of Large Civil Aircraft Composite Fuselage after Impact Damage
Authors: Wu Yuzhen , Liu Fu 
Published: March 2023

Abstract
This paper analyzes the post-impact pressure loss test data of eight test configurations of composite fuselage hat-type stringers and measures each composite stringer’s residual compressive strength. It compares the bearing capacity and failure strain of different configurations of stringers with and without BVID initial impact damage. Based on the test data and analysis, the optimal configuration of the stringer is selected, which plays a guiding role in the structural design of composite panels.
Preparation and Performance of a New Type of Large-head Cutting Pick with Bimetallic Composite
Authors: Liu Shuang , Zhao Yingfan , Gao Jing , Yan Zelin , Li Tieshuai , Tong Weiping 
Published: March 2023

Abstract
In this paper, a new type of pick with a large size head is produced by a low-temperature bimetallic composite. The pick head is composed of 60 mm long high chromium cast iron, and the pick handle is 20# steel. They are connected by nickel-based alloy powder. The size of the bonding interface observed by SEM is approximately 1.3 mm. The pick head is mainly composed of M7C3 and M2C compounds with high wear resistance to bear the wear resistance of the pick. The pick handle with outstanding toughness bears the impact of picks. It is also worth mentioning that the impact toughness of the sample reaches 62 J/cm2 and the shear strength is 208 MPa.The hardness of the handle is about 325HV, and the pick head hardness is about 935HV. The hardness gradually increases from the pick handle to the pick head.
Dislocation hardening coupling between hard matrix and soft zones in a dual-phase heterostructured material
Authors: Li Zhongkai , Liu Chunming , Liu Yujie 
Published: March 2023

Abstract
Strain hardening coupling between hard and soft zones is still not well understood in heterostructured materials. Here we report the coupling of dislocation hardening between hard iron matrix and soft copper zones in heterostructured Fe-40Cu dual-phase materials. Dislocation hardening is the predominant hardening mechanism in the Fe-40Cu materials, as dislocations dominate plastic deformation in both iron and copper. Low-temperature annealing kept highly deformed iron matrix strong and inductile but softened copper zones by promoting recrystallization in them. This raised plastic incompatibility and strain partitioning between iron matrix and copper zones during deformation. As a result, dislocations accumulated dramatically in copper zones but barely in the iron matrix. Copper zones produced high dislocation hardening to compensate for the low one of the iron matrix, raising the total strain hardening of the heterostructured Fe-40Cu materials. Lowering the plastic incompatibility between the iron matrix and copper zones weakened the strain partitioning between them and consequently depressed the dislocation hardening of copper zones. The role that copper zones played turned from producing high dislocation hardening to stabilizing the plastic deformation of heterostructured Fe-40Cu materials at the high strain level.
Screening of critical dangerous parts of Pi-shaped pipe in the corrosive environment
Authors: Lao Xingsheng , Liu Yong , Dai Chunhui 
Published: March 2023

Abstract
In order to accurately predict the key dangerous parts of the polygonal pressure pipeline in a corrosive environment, based on the stress fatigue theory, a stainless steel pipeline damage calculation model coupled with the coupling of fatigue and corrosion is established, and the cold and operating conditions are carried out for the polygonal pressure pipeline. The analysis of stress and damage fields shows that the fatigue life of the square-shaped pipeline is reduced from 9225 to 42 years after the influence of the stress concentration factor of pitting corrosion. Based on the results of the damage analysis, by defining the dangerous concentration parameters, it is predicted that the key dangerous parts of the zigzag pressure pipeline are mainly the elbow and the long side abdomen. The greater the dangerous concentration parameter is, the more concentrated the dangerous parts are. When the dangerous concentration parameter is greater than 0.5, the elbow of the pipe shoulder and the long side joint are not critical dangerous parts anymore.
Nickel Catalysts Supported on Ce
x
Sm
y
Zr1−x−y
O2-δ
Complex for CO2 Methanation and its Kinetic Analysis
Authors: Ye Jichao , Zhang Hanbing , Hu Xinwei , Zhang Lei , Wang Lina , Wang Hong 
Published: March 2023

Abstract
CO2 methanation shows advantages in Power-to-Gas technologies using renewable energy. In this article, Sm doped Ce
x
Sm
y
Zr1−x−y
O2-δ
complex is prepared using a one-pot hydrolysis method and is used as support for the Ru-Ni catalyst. The CO2 methanation activity at high temperature, GHSV, and thermal stability is tested. The results show that Sm doping is unfavorable for low-temperature methanation activity, but improves the thermal stability with Sm doping amount of 10 mol%. The Sm doping significantly enhances the performance at high temperatures (>400 °C ) and high GHSV (> 10000 h−1). Five reaction rate equations with different adsorption expressions are applied for kinetic analysis. Low activation energies ranging between 50.1 kJ/mol and 53.2 kJ/mol are observed for different models, which are lower than reported Ni-based catalysts. The equation considering both CO2 and H2O adsorption achieves the best-fitting results.
Analysis of Contact Characteristics of Rough Surface/Microporous For Flat Friction Pair
Authors: Li Zhenhua , Ahmat Mutellip , Zhang Quanyi , Zhou Huafeng 
Published: March 2023

Abstract
The rough surface has serious friction, wear and thermal damage during the sliding friction process in engineering applications, which leads to the failure of the friction pair. The rough surface contact is simplified into a rough surface with fractal properties and an ideal plane. The interaction between the asperities of the contacting body and the coupling effect of frictional heat flow at the frictional interface is considered. The impact of contact pressure and temperature rise between microporous model and non porous model on rough surface was compared, as well as the impact of Sa on the area, contact pressure and temperature rise of the friction pair. The results show that in the process of uniform sliding friction, when the asperities pass through the micropores, the asperities are embedded in the edge of the micropores so that the peak contact pressure increases, cutting occurs, and the deformation is affected by the interaction between the micropores and the asperities. The position of the highest pressure point is not fixed due to the deformation of the asperity, which improves the force of the asperity, and the micro-hole reduces the contact zone, thereby reducing the contact of the asperity and the pressure extreme point and reducing the pressure.Micropores reduce the temperature and enhance the wear condition of the end face. Small surface roughness can decrease the risk of end face wear.
In-situ Observation of High-temperature Phase Transformation of Ti-6Al-4V Titanium Alloy
Authors: Zhu Qiangqiang , Yang Xingdi , Lan Huifang , Li Jianping , Zhang Tianxing 
Published: March 2023

Abstract
As a typical dual-phase titanium alloy, Ti-6Al-4V has a complex phase transformation process, which is sensitive to temperature parameters and difficult to control its microstructure. To further master the law of phase transformation of Ti-6Al-4V titanium alloy and make a reasonable heat treatment system, different heat treatment systems in β single-phase region and (α+β) two-phase region were made for Ti-6Al-4V titanium alloy, and the phase transformation process and microstructure growth rate of different heat treatment processes were studied by high-temperature confocal microscope. At 1050 °C and 1200 °C in the β single-phase region, the β grain size increases with the prolongation of the holding time and the increase of the holding temperature. The tissue growth rate of the α phase was higher than 1200°C in the cooling process after 1050°C incubation, which was 2.88 μm/s. Based on the heat preservation in the single-phase region, the second heat preservation was carried out for the two-phase region of Ti-6Al-4V titanium alloy at 850 °C and 900 °C. The study found that when the holding temperature was 850°C, the fastest growth rate of the α phase was 4.64 μm/s, which was greater than 3.29 μm/s when the holding temperature was 900°C.
The Effect of Nickel Content on Phase Transition Characteristics of Ni-rich Fe-Ni Elastocaloric Refrigeration Alloys
Authors: An Junyu , Shi Yongjun , Li Xianfa , Chen Jiaxian , Wang Shaowei 
Published: March 2023

Abstract
In order to examine the impact of Ni content on the phase transition properties of Ni-rich Fe-Ni elastocaloric refrigeration alloys, the mechanical alloying (AM) and powder metallurgy (PM) technologies were used to create the Fe-Ni alloys.The results show that similar to the Ni-lacked Fe-Ni alloys, the phase transition characteristics varied with the different of Ni content and displayed various trends. Besides, it was found that the phase change enthalpy reached 44.43J/g when the Ni content was 50% (at%), which was about 1.3 times of Ni-lacked Fe14.6Ni (at%) alloy. In addition, different from the BCC structure with crystal space group of IM-3M (225) of Ni-lacked Fe-Ni alloy, Ni-rich Fe-Ni elastocaloric refrigeration alloys presented the FCC structure with crystal space group of FM-3M (225). This study provides an experimental reference for the preparation and application of Ni-rich Fe-Ni elastocaloric refrigeration content.