bluuebunny/crossref_metadata_2025_split huggingface dataset:
Development of the epoxy resin phase change proppant based on the Pickering emulsification technology
Authors: Qu Zhan-Qing , Fan Jia-Cheng , Guo Tian-Kui , Chen Ming , Wang Mei-Jia 
Published: March 2023

Abstract
Since the conventional solid proppant has many defects, such as poor migration and its rigid structures easy to plug cracks, liquid proppant has become a key development direction. A phase change proppant is developed based on the emulsified thermosetting resin system and evaluated in this paper. On the basis of the bisphenol A type epoxy resin, the phase change proppant system adopts the adduct of diethylene triamine and butyl glycidyl ether as epoxy resin curing agent and the SiO2 particles (1% of the resin mass) as the emulsifier, and then adds the hollow glass microspheres (1.25% of the resin mass) and the absolute ethyl alcohol (25% of the resin mass) as the thinner to reduce resin density and dilute resin. Proppant particles with major sizes of 4.5mm, 3mm, 2-2.5mm, 2mm, 1mm and 0.5mm are obtained through process optimization. After evaluation, the obtained proppants are of low density and high compressive strength, and their migration capability and flow conductivity are qualified for the exploitation of unconventional reservoirs with high closure pressures.
Design of automatic operation system of trowel based on stereo vision-inertial
Authors: Shang Yanjun , Liu Zhao , Zhu Yutian , Zhao Shiwen , Yao Yuanzhou 
Published: March 2023

Abstract
The trowel is a construction machinery used for slurry lifting and trowelling cement concrete surfaces. The machine is noisy and has certain dangers during operation. This paper focuses on the automatic operation of the trowel and takes the driving hydraulically driven trowel as the research platform. According to the overall requirements of automatic operation, with the stereo visual-inertial navigation system as the core, a positioning system and a full coverage path planning scheme are designed. The real data was collected in the test site for the experiment, and the results show that the stereo visual-inertial navigation system can provide the required positioning accuracy for the trowel.
Study on the facility airworthiness requirements and conformity verification method of aircraft leveling meanings
Authors: Han Li 
Published: March 2023

Abstract
The aircraft measurement is the inspection of the relative position of the various parts, the installation quality of the parts and their deformation in the process of use, and the airworthiness regulations have clear requirements for this. This paper carries out the research based on the requirements of the airworthiness regulations, clearly determines the facility airworthiness technical requirements of the aircraft level, gives the suggested design requirements, clarifies the practical and feasible compliance verification methods, and provides a reference for the airworthiness certification of the civil transport aircraft.
Research on Automatic attitude adjustment Technology of Suspension rail of the Unfolding frame
Authors: Zhao Danni , Li Deyong , Li Haiyue , Zhao Linna , Zhang Yue , Gao Yongliang , Yang Hongmiao , Li Jinbao 
Published: March 2023

Abstract
Spacecraft solar wings, antennas, and other space deployment mechanisms need to be unloaded by gravity during the ground launch test. At present, the most widely used is the guide rail type Micro-gravity unfolding frame, and the rail needs to be adjusted horizontally before the test is carried out. Aiming at the shortcomings of the current rail debugging relying on labor, difficult high-altitude operation, and low debugging efficiency, a guide rail automatic attitude adjustment device is proposed, which can quickly realize the efficient adjustment and attitude maintenance of the rail level. After test verification, the system can increase the local level of the guide rail from the traditional 0.02 mm/m to 0.01 mm/m, the overall level from the original 0.1 mm/m to 0.02 mm/m, and shorten the commissioning time from the original 4 h to 1 h. The power-off holding ability is strong, which greatly improves the efficiency of the ground test. The research results have been applied to other spatial deployment institutions that conduct tests based on rails.
Research on Resistance Prediction Method of Conventional Planning Hull Based on BP Network
Authors: Gao Xianjiao , Jiao Jun , Shi Shengzhe 
Published: March 2023

Abstract
Resistance performance is an important factor affecting the usability and economy of planning hulls. This paper proposes to use the neural network to build the relationship model between the characteristic parameters of the planning hull and its hydro-resistance performance. Six form parameters (such as overall length, breadth of chine line, et al ) and six state parameters (such as displacement, velocity, et al.) are selected as characteristic parameters. The resistance coefficient is selected as the research indicator. The neural network response model is constructed by taking characteristic parameters as input variables and the research indicator as the output of the network. The mean squared error and determination coefficient are treated as performance function and assessment indicators respectively. After training, we compare the output of the network with the experimental results. It shows that the predicted value of the network agrees well with model test results with the determination coefficient reaching 0.99. This illustrates that the trained network has high precision in capturing the relationship between characteristic parameters and resistance coefficient, which provides a new way of resistance prediction for the conventional planning
Adsorption Structure Design of a Wall Climbing Robot for a Spherical Tank
Authors: Wang Guoqing , Meng Fanzhao , Wei Hongmei , Li Xuan , Wei Zhigang , Yin Wenbo 
Published: March 2023

Abstract
The main body of the LPG (Liquefied Petroleum Gas) spherical tank is a spherical shell, which is a component to store materials and bear the working pressure of materials and the static pressure of the liquid column. Because most spherical tanks are pressure or cryogenic vessels, most materials are flammable and explosive, and the loading capacity is large. Once an accident occurs, the consequences will be unimaginable. Therefore, more and more companies and research institutes are now involved in the research of robots suitable for the operation of spherical tanks. Among them, the foundation and premise of the spherical tank climbing robot are stable and have reliable adsorption capacity. Based on in-depth investigation and research on the existing robot adsorption structure and considering its actual working conditions, this paper designed an adsorption technology based on the combination of permanent magnetic adsorption and electromagnetic adsorption, which mainly focuses on permanent magnetic adsorption and automatically adjusts the electromagnetic adsorption force according to the robot attitude. Thus, the robot has good adsorption and driving performance at any position on the ball wall.
Reliability-based Graded Maintenance Cycle Optimization of Electronic Equipment
Authors: Shen B , Liu S R , Xie S , Xiu R 
Published: March 2023

Abstract
With the increase in the number of modern equipment and the huge scale of equipment, the role and significance of clustering and systematic research have gradually become prominent. This paper studies the relationship between the benefit of a system composed of multiple pieces of electronic equipment and the maintenance period and uses the Monte Carlo method to realize the quantitative simulation of the system’s benefit under the known maintenance period. On this basis, the simulated annealing algorithm and genetic algorithm in the intelligent optimization algorithm are used to optimize the typical two-level maintenance cycle combination, which can quickly obtain the maintenance cycle that maximizes the annual system benefit. Finally, the difference between the results of the two optimization algorithms is compared and analyzed.
Simulation study on triboelectric nanogenerator based roller of belt conveyor
Authors: Tian Han , Liu Boyan , Zhao Jian , Wang Honglei , Yang Xiaohui 
Published: March 2023

Abstract
In this paper, a belt conveyor roller based on triboelectric nanogenerators is designed. This device can harvest energy from the roller rotating without introducing additional resistance to system and increasing the overall energy consumption. In this paper, a simulation study is conducted for different structures of the rollers to investigate the effects of the electrode number and electrode radian on the electrical properties of the device.
Research on the Economic Dispatch of Power Systems with a High Proportion of Renewable Energy based on Improved PSO
Authors: Jin Mingming , Wang Mingdong 
Published: March 2023

Abstract
The penetration rate of renewable energy sources represented by wind power and photovoltaics in the power grid is increasing, adding complexity to unit dispatch. In this paper, a multi-objective optimization model is established for power systems containing wind power and photovoltaic economic dispatch. Firstly, the power generation cost of traditional units, the emission cost of traditional units, the power generation costs of wind turbines and photovoltaics, and the output characteristics of wind power and photovoltaics are analyzed. Secondly, a multi-objective economic dispatch model with the lowest power generation cost, the smallest emission cost, and the smallest power generation cost of new energy units are established, and the power flow balance constraint, supply and demand balance constraint, unit output constraint, and node voltage constraint are considered. Then the improved particle swarm algorithm is proposed to solve the multi-objective function to obtain better convergence and optimal solution. Finally, the simulation is carried out in the IEEE-30 node system and the HRP-38 system, which compares and illustrates the similarities and differences of the solution results of various algorithms under multi-objective and verifies the effectiveness of the algorithm.
Study on Carbon Ecological Evaluation Method of Multi-microgrid under Two-carbon Background
Authors: Lin Han , Wang Zhijie , Zhou Xianli 
Published: March 2023

Abstract
In view of the current problem that there is no comprehensive, scientific, and reasonable evaluation method for the comprehensive operation benefit of a multi-microgrid under dual-carbon background, the carbon ecological evaluation index system and evaluation method model of the multi-microgrid under dual-carbon background are put forward. First, with the relevant indicators of dual-carbon as the core, the carbon ecological evaluation index is selected on the basis of fully analyzing the influencing factors of the carbon ecology of the multi-microgrid. Then, through the correlation analysis of the index model and data, the multi-microgrid carbon ecological evaluation index system is constructed based on the network-level analysis method. And the comprehensive empowerment of the ecological carbon index is made based on the optimization combination model of subjective and objective weights. Then VIKOR evaluation method is the carbon ecological evaluation results. Finally, a multi-microgrid carbon ecological evaluation function based on deep reinforcement learning is established to ensure the accuracy and real-time performance of the evaluation results.
Polarization-Independent Dual-Band Metasurface Absorber for Wireless Power Transmission
Authors: Gao Xiang , Wang Xinren , Wang Weijun 
Published: March 2023

Abstract
A new design of a polarization-independent dual-band metasurface absorber based on an improved Minkowski fractal structure is proposed in this paper. It is designed for wireless power transmission. The proposed metasurface absorber is composed of many sub-wavelength elements. By adjusting the structure of the elements, it has rotational symmetry and multi-frequency resonance characteristics. The proposed metasurface absorber array can keep more than 87% harvested efficiency at 2.45GHz and 93% harvested efficiency at 5.8GHz for arbitrary polarization of incident electromagnetic waves. The working frequency of the proposed absorber can cover the main working frequency bands of the current microwave wireless energy transmission system. The proposed metasurface absorber, which has the great advantage of subwavelength, polarization-independent, and high harvested efficiency, is suitable for wireless power transmission, especially in ambient power harvesting and UAV remote power supply.
Fault diagnosis method of hot die forging press based on short-time Fourier transform and optimized convolutional neural network
Authors: Yuan Chao , Ma Xiaotao , Ling Yunhan , Zhang Nan , Lin Boyu , Pan Lidong , Hou Huimin , Zhang Hao 
Published: March 2023

Abstract
Aiming at the vibration signals of rolling bearings of a hot die forging press, which are nonlinear, unstable, and easily disturbed by strong background noise, a fault diagnosis method based on a short-time Fourier transform and optimized convolutional neural network was proposed. First, the Fourier transform was applied to the vibration signals of rolling bearings of a hot die forging press to obtain complete time-frequency samples. After spectrum compression, it is input into the convolutional neural network model. By optimizing activation function and adjusting network parameters, the purpose of efficient and fast detection in the case of small samples can be achieved. Through the simulation test, the feasibility and effectiveness are verified. The results show that the proposed method has high recognition accuracy for fault diagnosis of rolling bearings of hot die forging press.
Research on Welding Process of Duplex Stainless Steel S31803
Authors: Liu Jian , Niu Huli , He Yazhang , Zhang Yinuo , Sun Xinyan 
Published: March 2023

Abstract
The welding test of duplex stainless steel S31803 pipe was carried out by means of argon tungsten arc welding as backing, hot welding, and manual arc welding as filling and covering. The mechanical properties, microstructure, phase ratio, and corrosion resistance of the welded joint were studied and analyzed through the test method. The results show that the appropriate welding parameters can control the proportion of ferrite and austenite, the mechanical properties, ferrite content, and pitting resistance of welded joints to meet the relevant requirements of the standard, and the established welding process has a good guiding role for the welding of duplex stainless steel in gathering and transmission pipelines.
Simulation design based on piezoelectric photoelectric composite energy harvester
Authors: Wang Jieping , Song Jiaming , Li Shixiang , Liu Hongmei , Dou Yanwei 
Published: March 2023

Abstract
A simulation design based on piezoelectric-photoelectric composite energy harvesters is proposed to solve the limitation that different energy harvesters can only work under certain conditions. The design of composite energy harvesting can capture sunlight and produce electrical energy and can also harvest vibrational energy in the environment to generate electricity from it. Cantilever beams with 6 different structures are simulated. The resonance frequency of the T-shaped cantilever beam is only 40 Hz, which can be used to collect vibration energy in the environment. The effect of different thicknesses of perovskite solar cells on the output performance was simulated. When the perovskite layer was 500 nm thick, the open circuit voltage could reach 1.08 V. The piezoelectric module and the photoelectric module are integrated into the energy collection circuit, which can collect vibration energy and light energy at the same time. The maximum output power may be obtained as 290 μW when the load resistance is 35 KΩ, and the output voltage at this time is 3.18 V. The structure broadens the application environment of the energy harvester and has the function of improving the output.
Intelligent optimization of landing gear retraction based on physical simulation
Authors: Ye Yuxin , Yin Yin , Wei Haifeng , Wang Boliang 
Published: March 2023

Abstract
The design of the retraction mechanism is an important part of landing gear design, and optimizing the space retraction mechanism is extremely difficult. An intelligent optimization model of landing gear retraction based on physical simulation is established to investigate further the recently proposed innovative design method for landing gear retraction trajectory. The theoretical kinematic model is combined with a collision detection algorithm to realize the interference check during landing gear retraction. An intelligent algorithm uses the minimum clearance between the landing gear and cabin segment as the evaluation index to optimize the key retraction parameters. The results of the optimization case show that the physical simulation model based on the Devillers algorithm established in this paper can effectively guide the intelligent design of key parameters of landing gear retraction.
Simulation and Optimization for Position Servo Control System of Switched Reluctance Motor
Authors: Diao Han , Xia Hongji 
Published: March 2023

Abstract
Switched reluctance motors are widely used in household appliances, textile machines, electric vehicles, and other fields due to their simple structure, low cost, high reliability, high efficiency, large starting torque, and wide speed regulation range. With the continuous expansion of the application field of SRM, higher requirements are put forward for the design of the motor position servo control system. The control system should be highly accurate and easy to deploy and have strong anti-interference. Based on the traditional switched reluctance motor control method, this paper designs a feedforward control position loop and applies CVC control at low-speed conditions to optimize the accuracy, anti-interference, and torque ripple characteristics of position servo control. The simulation results prove that the design results of the servo control system are correct and effective.
Research on Heat Dissipation Characteristics of Protective Fluid for Immersed Lithium-ion Battery Module
Authors: Yu Shuai , Xu Yanzhe , Liu Fei , Wang Yongmao , Leng Feng , Hu Qiwei 
Published: March 2023

Abstract
In this article, the immersed lithium-ion battery module’s liquid cooling and heat dissipation scheme are studied, and the heat dissipation characteristics of the large-capacity battery module after the battery is grouped are analyzed. The simulation models of the liquid cooling system’s five inlet and outlet layouts are established. The numerical results show that immersed liquid cooling method can effectively prevent and reduce the temperature rise of large-capacity battery modules. The layout of the imports and exports can influence the heat transfer effect, which is of guiding significance for the design of immersed protective fluid heat dissipation of lithium-ion battery modules.
Research on the Aerodynamic Performance of an Airfoil
Authors: Chen Haotian , Liu Yijun , Zhang Yunuo 
Published: March 2023

Abstract
Airfoils provide lift force for planes and keep planes flying in the atmosphere. Different airfoils have distinct performance characteristics based on their shapes, influencing the flying condition of planes and people’s safety. Therefore, an airfoil’s shape must be carefully studied and deliberated on because it’s an engineer’s professional duty to protect people’s safety with engineering knowledge. In this paper, physical and mathematical models are applied to analyze the shape and corresponding characteristics of an airfoil. Models, including Bernoulli’s Equation and Ideal gas Law, are applied, which are fundamental engineering models. Professional computational tools, including Matlab, are also utilized for the accuracy of data and plots and convenience in data analysis. As aeronautics technology keeps developing, more challenges will arise. Based on the data of existing airfoils, this paper also brings some considerations for the future of airfoil designs which are going to need to satisfy more flying conditions and types of aircraft.
Improved CsPbBr3 Light-Emitting Diodes with Sodium Trifluoroacetate Additive
Authors: Hao Xiaoming , Si Junjie , Zhao Hong , Liu Zugang 
Published: March 2023

Abstract
The perovskite light emitting diodes (PeLED / PeLEDs) possess the high efficiency and the wonderful color purity properties. However, the poor operational stability has hindered its broader development and commercial application. Utilizing the all-inorganic perovskites to fabricate PeLEDs is considered useful for enhancing device stability. In contrast, the resultant perovskite crystals in the emissive film show large grain sizes and low photoluminance efficiency. In this work, the sodium trifluoroacetate additive is introduced into all inorganic perovskite films to passivate surface defects and control the growth of the CsPbBr3 crystal. This approach results in inorganic perovskites with smaller grains and uniform surface morphology, which enables improved device performance.
Monte Carlo simulation of HERD side-on transition radiation detector prototype
Authors: Dai Cong , Liu Hongbang , Xu Ming , Feng Huanbo , Xie Fei , Liu Xiwen , Huang Yongbo , Lu Xiang , Dong Yongwei , Liang Enwei 
Published: March 2023

Abstract
The High Energy cosmic-Radiation Detection facility (HERD)
is a calorimetry-based cosmic-ray detection mission on board China
space station. A side-on transition radiation detector (TRD) focuses
on the TeV energy range calibration of the HERD calorimeter with an
error of less than 10% by measuring the Lorentz factor γ of
high-energy cosmic-ray protons. A side-on TRD prototype was
developed for the performance study and tested by Deutsches
Elektronen-Synchrotron electron beams. In this paper, the Monte
Carlo simulation based on GEANT4 was compared with the experiment
results. All simulations were in good agreement with the test beam
results.
Gender vulnerabilities in low carbon energy transitions: a conceptual review
Authors: Sadiqa Ayesha , Sahrakorpi Tiia , Keppo Ilkka 
Published: March 2023

Abstract
Low carbon energy transitions are of paramount importance to achieve climate goals. These transitions are not only technical and economical, but also deeply social and gendered. In this paper, we reviewed the academic literature to understand: firstly, what gender vulnerabilities have been discussed in the literature and how they have been embedded in structural dynamics. Secondly, what socio-cultural and socio-economic drivers may lead to these gendered vulnerabilities? Based on content analysis, four key themes emerged from this literature survey: land use change, gender-neutral energy policies, access to resources, and green practices, gender, and culture. These four themes indicate that there are several enabling mechanisms arising from social and structural inequalities, indicative that vulnerabilities ought not to be considered in isolation, but in relationship with others. We also explored dimensions of vulnerability (exposure, sensitivity, adaptative capacity) based on Carley et al (2018 Nat. Energy
3 621–7) to contextualise components of vulnerability in relation to gender. The main finding suggests considering further intersectional approaches to low carbon energy transitions, emphasising acknowledging, and lessening societal inequalities.