bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Radio Energy Transmission System Based on Parity-Time Symmetry
Authors: Li Zhongkui , Rong Qingfeng 
Published: June 2023

Abstract
Magnetically coupled resonant WPT technology can realize long-distance power transmission, which is currently a research hotspot. However, in practical applications, the position between the receiving and transmitting coils is not fixed, and its transmission power and efficiency are greatly affected by the coupling coefficient, which hinders the application and promotion of magnetic coupling resonance technology. To solve this problem, this paper proposes a magnetically coupled resonant radio energy transmission system based on parity time symmetry, designs the system structure, analyzes and explains its working principle and characteristics in detail, and finally verifies the practicability and rationality of the system through simulation analysis.
Design of Log Analysis System Based on Multi-Object Clustering Algorithm
Authors: Hao Xiaowei , Wu Hanwei , Gao Xurui , Liu Xiu 
Published: June 2023

Abstract
With the rapid development of the information age and the continuous expansion of data, all walks of life have begun to collect and analyze massive amounts of data to extract information that is valuable to them. Clustering technology in data mining is an important means of data analysis. Because different data sets have different distribution characteristics, traditional single-object clustering cannot adapt to the effective processing of different data sets, so multi-object clustering has gradually become a research hotspot. The purpose of this paper is the design of log analysis system based on a multi-objective clustering algorithm. This article first determines the main goals of the log analysis system and performs a detailed analysis of the system’s demanding functional analysis and demanding non-functionality respectively. The log analysis system is mainly divided into five modules for the detailed design of the log analysis system. After the system design is completed, various functional modules are completed through corresponding technologies, the entire log system is tested for attacks, and the system is further improved. Finally, the system can completely analyze the attack type through log analysis and carry out relevant early warnings to meet the needs of users. When the data set is 1.8MB, the convergence time of the K-medoid algorithm is 3678.49, and the convergence time of the algorithm in this paper is 2536.42. When the data reaches 165MB, the convergence time of the algorithm in this paper is 4326.28, and the convergence time of the K-medoid algorithm is 8184. This shows that as the scale of data continues to increase, the processing time difference changes and the processing speed of this algorithm has obvious advantages.
A distributed beamforming interference minimization algorithm based on node selection
Authors: Jia Si Yu , Hao Wen Hui , Wang Xing Jian 
Published: June 2023

Abstract
Distributed beamforming uses nodes in a wireless sensor network to transmit signals in different phases with controllable delay, to obtain coherent output signals with a gain after superposition. However, a wireless sensor network has a large topological area and wide distribution range, and it is difficult for distributed beamforming to obtain a highly directional beam as centralized beamforming does, which will cause interference to the non-target base stations. To solve this problem, a discrete adaptive dual-population cooperative differential evolution (DPCDE) algorithm is proposed, which can effectively reduce the interference by selecting nodes suitable for participating in distributed beamforming in a wireless sensor network. Simulation results show that the proposed algorithm can optimize the node set participating in distributed beamforming to minimize the interference of the wireless sensor network to the non-target base stations, and the effect is better than other classic intelligent optimization algorithms.
A High Precision Joint Time Synchronization and Location Algorithm for Moving Target
Authors: Liu Yufei , Huang Jiyan , Liu Zhiyuan , Tan Yanmin , Kuang Zhendong 
Published: June 2023

Abstract
Time synchronization is the guarantee of normal operation of wireless sensor networks, and it is the premise of ranging and location. At present, most researches focus on joint time synchronization and location of non-moving targets, while there are few types of research on joint time synchronization and location of moving targets. Therefore in this paper, under the condition that the time synchronization of the moving target is not carried out, and the information measurement means such as the speed and position of the moving target are not available. We established the system model of joint time synchronization and location with the help of the anchor nodes whose clock has been synchronized and location is known, and derived the Cramer-Rao lower bound (CRLB) of the system. Then we proposed the two-step least square method and iterative method. The former has lower computation and suboptimal performance, while the latter has higher time synchronization accuracy and positioning accuracy, which can attain CRLB. The results are verified by simulation.
Broadband THz Edge-Enhanced Imaging Technology Based on Electro-Optic Sampling
Authors: Yuan Xingming , Li Ying , Lin Qinggang , Chen Jiapin , Cai Yi , Xu Shixiang , Li Jingzhen 
Published: June 2023

Abstract
Based on the radial Hilbert transform of spatial filtering and electro-optical sampling, we propose a broadband terahertz edge-enhanced imaging method in this work. Instead of using a narrow-band THz vortex phase plate, here we use vortex ultrashort laser pulse to realize the THz enhancement imaging which can be applied for few-cycle THz imaging. The principle of edge enhancement is analyzed theoretically, and the analytical expression of the final terahertz imaging is derived. We found that edge-enhancement imaging corresponds to the nonlinear term of the THz field, and the background and linear terms can be suppressed when the static birefringent phase is set to zero. The simulations show that our method can effectively improve the contrast and signal-to-noise ratio of terahertz imaging.
Random Multi-access Scheme Based on Group Testing Theory for Massive Machine-type Communication
Authors: Wang Hong , Liu Xiangyang , Xie Yunhong , Xu Xiaotao 
Published: June 2023

Abstract
Considering emerging massive machine-type communication with very few devices simultaneously transmitting short messages, random multiple access has currently become a research hot spot since the traditional multiple access protocol struggles to work properly. Inspired by the superimposed code, a channel assignment scheme based on non-adaptive group testing theory is proposed to allow multiple users to share a single channel at the same time. A superimposed code with threshold value d, which can recover the original code through the Boolean sum of up to d codes, is constructed by studying the problem of group testing. When the number of active users with a message to be transmitted is no more than the threshold value, active users encode their messages by the superimposed code and multiple active users transmit their messages together by sharing a single channel. The receiver can decode the mixed messages by the disjunction of the superimposed code. We focus on the design of the superimposed code by group testing theory, formulate this problem as the construction of a transversal design, and use the Latin square to form a useful transversal design. Theoretical proof shows that our design works well under limited circumstances where the number of active users does not exceed the threshold value. Additionally, our design can recover the original codes by the mixture of codes, which are more easily than the algorithms based on compressive sensing. Simulation analysis presents that our design performs better than the traditional competitive access protocols in terms of successful probability, throughput, and packet loss rate.
Preparation of Hydrophilic Antifogging Film Materials by Silicate Minerals
Authors: Wei Shenyu , Wang Lei , Peng Cheng , Zheng Qi , Cui Xinglan , Che Xiaokui , Yu Zeen 
Published: June 2023

Abstract
Silicate minerals are widely used as green, nontoxic, low-cost materials. In this experiment, hydrophilic antifogging films of silicate minerals were prepared by the vacuum evaporation coating method. The hydrophilicity, antifogging performance, optical properties, and surface morphology of the film materials were analysed and characterised by the contact angle meter, the hydrothermal method, the ultraviolet-visible spectrophotometer, and the atomic force microscope, respectively. The results show that the contact angle of the prepared mineral hydrophilic antifogging film is less than 25° and is hydrophilic. When the thickness of the film is 100–200 nm, the antifogging effect is the best. As the thickness increases, the antifogging effect weakens. The film material has little effect on the transmittance of the substrate. When the film thickness is 100 nm, the maximum transmittance is 92.2%, which is 4.5% higher than the uncoated substrate and has some effect on increasing the transmittance. With the increase of film thickness, the mineral material nanoparticles gradually accumulate densely on the substrate surface, and the roughness of the sample surface decreases, which leads to the decrease of hydrophilic properties and antifogging performance of the film.
Lithium storage properties of Sn/C composite anode materials
Authors: Huang Zhaowen , Huang Chuting , Li Youpeng , Zhao Lingzhi 
Published: June 2023

Abstract
In this paper, tin-carbon composites were prepared by the hot carbon reduction method and used as anode materials for lithium-ion batteries. The results show that the hot carbon reduction method can effectively reduce SnO2 to spherical metallic tin, and the excess of carbon affects the size and shape of tin spherical particles. The higher the tin content is, the higher the lithium intercalation potential of the anode material is. The improvement of cyclic stability of tin-carbon composites is at the expense of reversible capacity. The core-shell structure of pitch pyrolysis carbon can effectively inhibit the reversible capacity decay caused by tin volume expansion.
Effect of Cobalt Content on the Properties of Nickel-Cobalt Alloy Coatings
Authors: Wang Yunhuan , Liu Quan , Ding Mingli , Li Hongao , Yang Songru , Guo Cean , Zhang Jian 
Published: June 2023

Abstract
A batch of nickel-cobalt alloy coatings was pulse-electroplated on gun steel (PCrNi3MoVA) surface, in which weight fractions of Co element are 39.9 %, 55.5 %, 67.5 %, and 79.8 %, respectively. The formations of phase and crystal structure in nickel-cobalt coatings were investigated by X-ray diffraction analysis. The layers’ surface morphology and chemical composition were analyzed by scanning electron microscopy coupled with energy dispersive spectrometry. The tribological and nano-mechanical performances of the coatings were used to evaluate by high-speed reciprocating friction and wear tester and nanoindentation tester, respectively. The results showed that the preferred orientation of the coatings gradually changed from (111) to (220) with the rising cobalt content, resulting in changes in the surface morphology of the coatings from pyramidal grains to spherical particles and then to a triangular pyramid structure. As the Co content was 55.5 wt.% in the nickel-cobalt coating, its crystalline grain size reached the smallest value of 11.53 nm, enhancing the hardness and wear resistance.
Flow Characteristics of Orifice Plate in Vertical Multistage Flash Evaporator for Waste Heat Recovery
Authors: Sun Yifan , Yan Huaizhe , Wang Lin , Shen Haihua , Xu Ziyun , Fang Fenglei , Li Haoran , Li Hui 
Published: June 2023

Abstract
A vertical multistage flash device uses orifice plates as pressure isolation devices, so wastewater flows from the upper stage to the next stage by its gravity, which can significantly lower the system’s surface area. To study the resistance characteristics of the flash flow during wastewater flowing through the pressure isolation device, a flow and flash model for the wastewater in an orifice was developed and the corresponding flash process was numerically investigated by FLUENT. The effects of the inlet temperature of wastewater, flash pressure, and orifice thickness on the flash were analyzed. The results show that the closer to the orifice outlet we are, the lower the temperature of wastewater and the larger the vapor volume fraction become. While the temperature is lower, the vapor volume fraction is larger near the orifice wall than it is towards the center. While the temperature reduction of wastewater is not immediately apparent, the vapor volume fraction in the orifice increases as the pressure differential between the orifice’s input and output increases.
The corrosion behavior of TA1 and TC4 in Proton Exchange Membrane Water Electrolyzers
Authors: Huang Yao , Yue Luo , Chang Liang , Zhang Gaoqun , Hu Xiao , Xu Guizhi , Deng Zhanfeng , Mao Hangyin , Feng Jia 
Published: June 2023

Abstract
Titanium Bipolar Plates (BPPs) are frequently utilized in Proton Exchange Membrane Water Electrolyzers (PEMWE) nowadays since they could endure the challenging working environment. Notably, the extreme anodic potential and acidic environment of the PEMWE are extremely critical for BPPs’ performances. In this study, we explored the corrosion behaviors of conventional titanium alloys of TA1 and Ti-6Al-4V (TC4) at simulated operating conditions. To evaluate their corrosion behaviors, potentiodynamic polarization, electrochemical impedance spectroscopy, and potentiation, polarization experiments were executed. Additionally, scanning electron microscopy (SEM) was applied to detect the morphologies before and after the electrochemical measurements. Finally, the corrosion mechanisms of TA1 and TC4 were analyzed and discussed by X-ray photoelectron spectroscopy (XPS). After 7 days of potentiostatic polarization, the corrosion current density of TA1 remained at 3×10−8 A·cm−2, which was nearly one order of magnitude lower than that of TC4. These experimental data confirmed that the TA1 alloy had superior corrosion resistance to the TC4 alloy during long-term running in PEMWE operating conditions.
Scheduling optimization of wind-solar power generation system based on Power to Gas
Authors: Wang Zhengtai , Wen Fawei 
Published: June 2023

Abstract
Storage technology and consumption technology can reduce the amount of abandoned wind and sunlight, improve the utilization of new energy, and reduce cost. Firstly, this paper describes the role of P2G (Power to Gas) technology in the field of new energy consumption, then builds the economic cost-optimal day-ahead optimal dispatch model based on a microgrid, examining the ability of P2G devices to consume new energy. Finally, three different scenarios are applied in the example for verification. The calculation example proves that P2G devices have a good effect in the field of scenery consumption and reduce the cost of the microgrid.
Design of Practical Engineering Strategies for Stabilizing Perovskite Solar Cells
Authors: Liu Yuxuan 
Published: June 2023

Abstract
Perovskite solar cell (PSC), as an efficient and economic-friendly way of converting sunlight into electrical energy directly, has been developed fast in recent decades. Despite promising performance parameters, its long-term chemical stability is presently identified as the most crucial challenge hindering practical application and commercialization, preventing future developments. Recent research showed that introducing materials with suitable traits, and alternating structures of interfaces are important in slowing degradation rates. To illustrate a comprehensive picture of up-to-date strategies taken by different researchers in enhancing PSC durability, this review divides the strategies into five categories: material hydrophobic properties, easing ion migrations, slowing degradation reactions, enhancing molecular chemical interactions, and reducing surface defects, which are five pathways that may lead to more useful interventions in the future.
Experimental Study on Removal of Gaseous Arsenic by CuO/TiO2 Catalyst
Authors: Zhang Bowen , Wu Jiang 
Published: June 2023

Abstract
The emission of arsenic from thermal power plants poses many hazards to humans and the environment, so controlling arsenic emissions is an urgent problem to be solved. This paper prepared CuO/TiO2 adsorbent by selecting TiO2 with a large specific surface area as the substrate. The adsorption performance of CuO, TiO2, and CuO/TiO2 adsorbent materials on gas-phase arsenic at different reaction temperatures (500 °C, 600 °C, and 700 °C) was investigated. The experimental results showed that CuO/TiO2 adsorbent had better arsenic adsorption capacity than CuO and TiO2 because CuO/TiO2 has a large specific surface area and rich surface-active sites. The temperature affects the performance of the adsorbents, and all three adsorbents do not perform well at 700 °C, mainly because the metal oxide materials are not resistant to high temperatures, and the mesoporous structure is easily collapsed. CuO/TiO2 adsorbent is suitable for the control and emission reduction of heavy metal arsenic in coal-fired flue gas at medium and low temperatures below 600 °C. The above study provides a direction for developing and applying adsorbents to remove gas-phase arsenic.
Surface Geometry, Electronic and Thermodynamic Properties of SrCeO3 (001): First-Principles Calculation
Authors: Li Qingjun , Lu Haotian , Yang Kun 
Published: June 2023

Abstract
This study uses first-principles density functional theory (DFT) to calculate the SrCeO3 (001) surface with CeO and SrO2 terminals. The influence of vacuum layer thickness on the geometric structure and energy stability is studied. The calculation by Materials Studio software shows that the surface with SrO as the terminal has obvious surface wrinkles compared with the surface with CeO2 as the terminal. The surface stability evaluation shows that the SrO termination surface is more stable in energy than CeO2. The band gaps of CeO2 and SrO terminals were determined to be 0.971eV and 1.733eV, respectively, which were smaller than those of SrCeO3 protocells.
Preparation of Azophenyl Photo-Induced Phase Transition Polymer and its Study on Adhesion Property
Authors: Chen Longxuan , Gong Piwen , Mu Jiahui , Zhao Ruiyang 
Published: June 2023

Abstract
The design and synthesis of photo-induced reversible adhesives are considered to be the solution to the problems of traditional adhesives in separating, recycling, and repairing. We have designed and synthesized an azophenyl copolymer (PNY-Azo) with photo-induced phase change properties. The adhesion strength of PNY-Azo varies greatly between trans conformation (solid-state) and cis conformation (liquid state), which is suitable for photo-induced reversible adhesives application due to the reversible photo-induced bonding/debonding process between two substrates. By increasing the number of oxygen atoms on the side chains of the copolymer, the supramolecular interaction (H bond) between the copolymer molecular chains and the entanglement of copolymer chains are improved, which can be enhanced the adhesion strength (up to 4.59 MPa) of trans conformation PNY-Azo effectively.
Combustion Characteristics of Diesel Methanol Blended Fuel Ship Engines
Authors: Ma Jun , Li Chunjin , Li Lei , Zhang Zengxin 
Published: June 2023

Abstract
With increasingly stringent fuel emission control in some river traffic control zones and inland waters, this paper addresses the problem of substandard diesel fuel emissions, relying on the theoretical basis of numerical simulation of diesel engine in-cylinder combustion. The combustion and emission characteristics of diesel-water-mixed methanol blended fuel are simulated and analyzed based on the AVL FIRE software. The combustion model of the diesel engine was established, and the changes of in-cylinder pressure, temperature, heat release rate, and emission concentration were investigated for D85W10, D85W15, and D85W20 blends respectively, which were compared with diesel. The results show that as the proportion of water in the fuel mixture increases, the in-cylinder temperature gradually increases, the in-cylinder pressure slightly decreases, the heat release rate does not change much, and the NO and Soot emissions decrease.
Electropolishing Behavior of 8xxx Al Alloy in Perchloric Acid and Ethanol Solution
Authors: Zhang Linhui , Zhong Binnian 
Published: June 2023

Abstract
The electropolishing characteristic curves of rolled 8079 Al alloy in perchloric acid and ethanol solution from -25 °C to 25 °C are obtained. The optimal electropolishing conditions of the 8079 Al alloy with rolled are investigated by optical microscope. The result shows that the lower the electropolishing temperature is, the longer the electropolishing time is, and the time range and voltage range are wider. Furthermore, the calibration rate of the phase after electropolishing is higher than 97% investigated by Electron Back-Scatter Diffraction. The electropolishing effect of both 8079 Al alloy with cast and 8011 Al alloy (cast and rolled) is verified.
Preparation of High Specific Surface Area Activated Carbon from Semi-Coke for Carbon-Based Supercapacitor Applications
Authors: Li Sai , Zhang Jinkui , Han Jinjin , Liu Kai , Wu Yan 
Published: June 2023

Abstract
With the continuous development of energy storage technology, a device between ordinary capacitors and batteries, with low cost, high performance, and no pollution, is attracting a lot of attention. Common supercapacitors are generally composed of four parts, of which the electrode material as a core part determining the performance of the capacitor, should be selected reasonably. Currently, the most commercially mature electrode materials are still dominated by porous carbon materials. In this paper, we prepared activated carbons with a high specific surface area by a simple chemical activation method using semi-coke, a derivative of coal after dry distillation, and activated at 800 °C. The prepared activated carbons had a specific surface area of 2522 m2g−1 and a pore capacity close to 1.5 cm3g−1. Moreover, the prepared supercapacitors showed excellent specific capacity and better multiplicative performance. This work provides a new inspiration for the preparation of high-performance activated carbon from low-cost semi-coke.
The Performance of SiO2 Nanofluid-based Split-frequency PV/T Energy
Authors: Nie Binghan , Qiu Zhongzhu , Zhang Yunpeng , Ni Xingrui , Zhang Miaomiao , Xu Ning 
Published: June 2023

Abstract
The efficiency of both solar photovoltaic and thermal power generation is relatively low, with the maximum panel temperature of conventional PV/T modules reaching 68.4 °C at noon, and the average electrical efficiency is only 12.98%. In this paper, the energy performance of a PV/T module based on SiO2 nanofluid was studied. Firstly, three different types of nanofluids, SiO2 nanofluid with a mass fraction of 0.3%, mass fraction of 0.5%, and mass fraction of 0.7%, were prepared and tested for their solar spectrum transmittance, and the results manifested that only the SiO2 nanofluid with 0.5% mass fraction exhibited strong absorption characteristics in the band after 400–1150 nm. Three liquid film thicknesses of 5 mm, 10 mm, and 15 mm, and three nanofluid mass fractions of 0.3%, 0.5%, and 0.7% were selected for the calculation of the spectral transmittance and the experiments on the thermal efficiency of the whole PV/T module. After conducting twenty-minute experimental tests on the power generation efficiency, thermal efficiency, and panel temperature of the flat panel, the results turned out the maximum efficiency reached 52.19%, which was found at a liquid film thickness of 10 mm and a nanofluid mass fraction of 0.7%, with a lower temperature of 40 °C, and an average of 10 °C lower than conventional PV panels.