bluuebunny/crossref_metadata_2025_split huggingface dataset:
Impact of Hybrid Plasmonic and Temperature in Random Laser Tuning
Authors: Aziz Gohar , Hayat Anwer , Iqbal Naeem , Zhai Tianrui 
Published: March 2024

Abstract
This research explores the interaction between silver films and dispersed silver nanowires (Ag NWs) in the context of generating random laser emission. To achieve random lasing, we use a mixture of Rhoda mine B (RhB) dye and a polyvinyl alcohol (PVA) matrix as the gain medium. The combination of silver components plays a crucial role in trapping and controlling light. The surface characteristics of the film, including its roughness and the interplay between localized and extended surface plasmons significantly affect the performance of the random laser (RL). The laser’s threshold is closely linked to the thickness of the film, which is influenced by its surface roughness. Additionally, variations in film thickness lead to wavelength modulation, ranging from 597 nm to 606 nm, primarily due to the reabsorption of RhB. Moreover, this research demonstrates the intriguing capability to tune emission wavelengths in response to temperature changes, promising precise wavelength control for plasmonic devices and potential applications.
Function optimization of ceramic firing process and reduction of energy consumption based on CFD simulation
Authors: Han Guangda , Zheng Naizhang , Wu Junming 
Published: March 2024

Abstract
Microwave sintering, as an efficient and energy-saving advanced sintering method, has advantages that traditional sintering methods cannot match, such as promoting ion diffusion and refining grains. This paper uses microwave heating equipment and solid-phase reaction method combined with microwave sintering technology to prepare ceramics. The treatment process of powders and the influence of microwave sintering parameters on the reduction of energy consumption in the ceramic firing process were studied, and the microwave sintering process was optimized. This article also uses computational fluid dynamics (CFD) as a tool to establish a numerical model of hydrodynamic sedimentation based on the Euler multiphase flow model, and it uses the established numerical model to conduct engineering scale research on the classification treatment process of processing waste. Finally, this article elaborates on the process of multi-process planning and optimizes relevant process parameters. This article builds on previous research by employing a BP neural network (BPNN) to determine the correlations between the many variables involved in the production of functional ceramics and their respective quality metrics. The experimental findings demonstrate the efficacy of the proposed methodology in performing intelligent tasks like process decision-making and optimizing process parameters.
Flow-induced Vibration of Two Tandem Oscillating Square Cylinders in Reattachment Regime
Authors: Wang Jun , Mahbub Alam Md. , Chen Qing , Lin Yiwen 
Published: March 2024

Abstract
To improve our understanding of structural stability, two vibrating tandem square cylinders is numerically investigated in the present study. In reattachment regime (L* = 2), mass ratios (m* = 3), Reynolds numbers (Re = 100) are considered. Different branches are identified. For the first cylinder, the maximum A* is about 0.10, which is one-third of a single cylinder. For the second cylinder, the maximum A* is about 0.42, which is 1.45 times of a single cylinder. Wake mode is observed, and the existence of the second cylinder restrains the vortex shedding from the first cylinder.
Mechanical performance analysis of prestressed socket assembled concrete frame structure relying on computer simulation analysis
Authors: Wang Fei 
Published: March 2024

Abstract
In order to improve the mechanical performance analysis of assembled concrete frame structure, this paper combines with computer simulation technology to analyze the mechanical performance of concrete frame structure, and uses the concrete damage plastic constitutive model provided by ABAQUS to define the nonlinear constitutive behavior of concrete. Based on the elastic-plastic model, the damage variables are added to the model, which can better reflect the performance of concrete under cyclic loading, such as stiffness degradation. In addition, this paper uses ABAQUS finite element analysis software to further analyze the structural parameters of this form of joints, and design related prestressed socket assembled concrete frame to study the seismic performance of prestressed socket assembled frame structure. Finally, the effectiveness of this model is verified by computer simulation.
Finite-time stability for impulsive stochastic nonlinear system with uncertain parameter
Authors: Wang Jun , Yao Fengqi 
Published: March 2024

Abstract
This paper considered the finite-time mean square stability for impulsive stochastic nonlinear system(ISNS) with uncertain parameter. By selecting the modal dependent Lyapunov functional, using average impulsive interval approach and combining Linear Matrix Inequality (LMI) method, the correlation stability criterion of ISNS was obtained. A gain matrix of the feedback controller is obtained on the basis of this sufficient condition. Finally, the LMI toolbox in Matlab was used for data simulation, and the relevant state trajectory demonstrates the availability of the proposed theory.
External defect detection technology and application status of transmission and transformation equipment based on video images
Authors: Hao Xiaolong , Lv Jin , Liu Dahui , Li Jinming , Cheng Xiangbin , Cao Cen 
Published: March 2024

Abstract
Power transmission and distribution equipment plays a critical role in supplying electricity to consumers. However, these assets are susceptible to external defects, such as corrosion, mechanical damage, and wear, which can lead to failures and disruptions in the electrical grid. Traditional inspection methods for detecting these defects often rely on manual inspections, which are time-consuming, costly, and subjective. To overcome these limitations, this paper explores the current state of video image-based external defect detection techniques for power transmission and distribution equipment. This makes up for the deficiencies of conventional approaches to inspecting and maintaining power transmission and transformation equipment by decreasing the waste of human resources and increasing the frequency and efficiency of intelligent operation and maintenance of power systems. This work investigates a completely convolutional block detection-based defect identification method to address the issue of defect recognition. The fully convolutional neural network is enhanced with the concept of block detection thanks to this approach. The local discrimination mechanism may be realized, and the drawbacks of the conventional block detection receptive field are avoided in the process. This approach offers improved generalization and fault identification over the original ResNet image classification system.
Effect of calcium content on the performance of CPVC cable protective tube
Authors: Ye Fang , Yu Jinshan , Sun Cheng , Wang Wei , Han Yongdian , Chen Qiang 
Published: March 2024

Abstract
The influence mechanism of different calcium content on the mechanical properties of cable protection pipe was studied, and the feasibility of feedback verification on the using performance of cable protection pipe through neural network learning method was also studied. Methods Shore hardness tester, universal electronic testing machine and densitometer were used to test the performance of cable protection tubes with different calcium content, and the quantitative relationship curve between cable protection tubes and performance was obtained. The database of hardness, density and composition was established through BP neural network, and the feasibility of feedback quality prediction was verified through test data. Results The hardness and density of the cable protective tube can be effectively improved by increasing the calcium element in the cable protective tube. Through the feedback prediction of performance by BP neural network, its qualification rate can be accurately predicted. Through this study, the content of calcium element can be adjusted appropriately according to the use conditions to make its performance meet the use conditions. Through Shore hardness tester and spectrometer, the quality of cable protection tube can be determined, and the nondestructive testing effect can be achieved.
Research on the Performance of Sound Absorption Materials for Substations in Power Grid
Authors: Wang He , Li Jintao , Sun Tong , Tian Yi 
Published: March 2024

Abstract
As the environmental protection policies become increasingly strict, higher requirements will be proposed for low-frequency noise control problems, and research on control strategies for low-frequency noise in substations is imperative. In this work, principles of resistive acoustic absorption and resonance acoustic absorption materials were analyzed. Based on the measurement in acoustic impedance tubes, the sound absorption performances of two typical sound absorption materials, the glass wool and the micro-perforated panel, were tested. This study offers a new reference for power grid companies to select and combines suitable acoustic materials to realize the optimal application in substations based on noise reduction requirements of different frequencies.
Research on Passive Location Strategy of UAV
Authors: Lu Yiming 
Published: March 2024

Abstract
Aiming at the problem of how to reasonably correct the position of UAV formation, we take the circular formation composed of 10 UAVs and the conical formation composed of 15 UAVs in the same plane as examples to study how to adjust the number and angle of UAV signal transmission so that the UAVs in the entire formation are in the designated position. This paper uses geometric model, greedy strategy and other methods, uses python, matlab and other software to obtain a reasonable and effective mathematical model, and makes a test and evaluation. The research results show that no matter circular, conical or other graphics, we can construct a triangle by connecting the transmitting signal and the receiving signal UAV, and solve the problem to obtain the best transmitting signal angle and the minimum number of sorties required; If there is no triangle between the UAV transmitting the signal and each UAV receiving the signal, the UAV receiving the signal will not reach the designated position. Nowadays, the use of UAVs is more and more extensive. The cooperation of multiple UAVs can complete many functions such as detection and performance, which is also the significance of our research on how UAVs can better receive signals.
Analysis on Mechanism and Characteristic of Vibration Fault on New Large Capacity Synchronous Condenser
Authors: Li Chenlong , Gu Wen , Xia Chao , Li Hewen , He Fengjun 
Published: March 2024

Abstract
Vibration faults are the most common faults in large capacity synchronous condenser. The article proposes 11 common vibration faults of condenser, including imbalance, misalignment, looseness, resonance, oil film oscillation, steam flow excitation, dynamic static friction, rotational stall, gear fault, rolling bearing fault, and other vibration faults. The article also proposes the mechanism, characteristics and case analysis of each type of fault separately. The research results on the mechanisms and characteristics of these faults are the foundation of condenser fault diagnosis, and are crucial for the development of intelligent decision-making systems and platforms. Which can provide the strongest technical support for improving power transmission and safety and stability of the power grid.
An Active Injected Location Method for DC Fault of Wind Power Based on Parallel Energy Absorption Module
Authors: Wo Renfei , Mei Jun , Diao Weiye , Guo Jiawei , Wang Guanghua 
Published: March 2024

Abstract
In recent years, the widespread adoption of wind power has been facilitated by the rapid advancements in new energy generation technology. The precise identification and efficient management of DC faults in onshore wind farms has gained increasing significance. To address issues such as limited functionality, low device utilization, and the inefficient use of fault energy prevalent in current fault location methods applied in wind power flexible grid-connected systems, this study explores the storage and reuse technology of fault energy. The article proposes a topology structure designed to absorb and reuse fault energy under multiple DC faults, aiming to overcome the challenges posed by single-function methods. The structure and control strategy of this topology are clearly delineated, and the design methodology for topology electrical parameters is thoroughly investigated. Simulation studies were conducted to validate the electrical characteristics of the employed devices and assess the operational effectiveness of the proposed topology within wind power grid-connected systems. In comparison with conventional fault location methods, the proposed scheme exhibits multiple energy absorption functions for DC faults and fault location capabilities, especially in the presence of permanent DC faults. As a result, this approach maximizes the utilization of DC fault energy, ensuring higher device efficiency and a broader spectrum of functionalities.
Forming Technology of a High-Frequency Conical Spiral Antenna
Authors: Zhu Lina , Luo Yiwu , Chen Lei , Wang Nan 
Published: March 2024

Abstract
This paper introduces the integrated stereo forming technology of high-frequency conical spiral antenna, focusing on the material selection and processing of the supporting substrate, the surface metallization technology of the substrate, the establishment of spiral CNC machining models, and the control of CNC machining difficulties. The technology has been successfully applied in engineering, ensuring the continuity and consistency of three-dimensional microstrip in space. It also resolves the offset address problems of docking ends and ports asymmetry caused by microstrip splicing technology. The advantages of this technology include high processing accuracy, good consistency, high stability, and short processing cycle. The high-frequency conical spiral antenna produced has been verified by antenna testing, adaptability tests of mechanical environment and temperature environment, and its performance is stable, which can meet the requirement of the design and application. It has been successfully applied to electronic countermeasures equipment. The test results indicate that the high-frequency conical spiral antenna has good electrical performance and consistency. So the integrated stereo forming technology for high-frequency conical spiral antenna is feasible and reliable. This provides a useful reference for the research on the similar products processability.
Analysis of Wire Breakage Fault Caused by Galloping on 66kV Debao A and B Line in November 2023
Authors: Xu Linfei , Zhao Bin , Zhang Sihang , Yang Zhi 
Published: March 2024

Abstract
In early November 2023, affected by extreme weather conditions such as rain, snow, and freezing, some transmission lines in northeast region experienced icing and galloping, which brought lots of tripping and disconnection faults. Taking the wire breakage faults of the 66kV Debao A and B line as examples, the causes, processes, and characteristics were all detailed analysed. It can be basically identified that after the first-order galloping of icing the wire, due to the lack of or limited effectiveness of anti-galloping measures, interphase flashover occurred. The flashover melted some of the stranded of galloping wire, resulting in dynamic tension caused by galloping concentrated towards the broken position, the remaining cross-section of the stranded. Due to repeated bending and stretching, the remaining stranded wires exceeded the limit of fracture stress, leading to fracture and overall wire breakage and landing. So the wire breakage fault in this case is strongly related to the interphase flashover caused by galloping. This article conducted fault analysis work by collecting line design, on-site meteorological conditions, and fault characteristics, providing technical support for subsequent prevention and control work.
Diagnosis and Treatment of Oil Film Whirl Fault in the Bearing of Large Synchronous Condenser
Authors: Xia Chao , Jiang Chen , Yu Dahai , Liu Yanan , Sun Chuan 
Published: March 2024

Abstract
The oil film vortex of a synchronous condenser rotor can cause an increase in bearing vibration. When the vibration amplitude exceeds the threshold value, it can cause the condenser to trip. The oil film vortex is related to many factors and often occurs during the start-up and acceleration process of the unit, as well as during the loading process of the unit. This article elaborates on the low-frequency oscillation accident of the bearing system caused by the oil film vortex fault of the rotor of a large synchronous condenser and its handling methods. This article presents a sudden low-frequency vibration of a large synchronous condenser. Based on the data collected on site and experimental test results, this condenser analyzes and diagnoses the low-frequency vibration incident, and ultimately determines it as an oil film vortex fault in the bearing system. The article combines the operation and maintenance plan of the synchronous condenser and conducts on-site dynamic balance tests on the synchronous condenser. After the dynamic balance test, the low-frequency vibration of the bearing system disappears and the fault is eliminated.
A Blocking Method for Bus Protection of CT Disconnection and Opening Method of HIF Based on Current Characteristics
Authors: Fang Yudong , Wang Zhijie , Chen Zhenyang , Li Yanjun , Feng Chuan , Yuan Jiawei , Jiao Zaibin 
Published: March 2024

Abstract
Current transformer (CT) disconnection in busbar can lead to erroneous operation of busbar differential protection. The existing methods for handling CT disconnection have not taken into account how to re-enable the protection in the case of high-impedance faults (HIFs). If the two types of faults cannot be distinguished in a timely manner, it can adversely affect the safe operation of the power grid. This paper provides a theoretical analysis of the differences between differential current and restraining current in the case of busbar CT disconnection faults and HIFs. Based on these characteristics, this paper proposes a criterion for CT disconnection fault blocking and a criterion for HIFs opening. Simulation results demonstrate that this method can effectively and accurately identify HIFs even in the presence of CT disconnection faults.
Design and Implementation of Intelligent Water Heater Based on STC89C52
Authors: He Ying 
Published: March 2024

Abstract
Smart home appliances have penetrated into every household, and the water heater industry is undergoing new changes. At this time, it is urgent to develop an automatic thermostatic system to ensure that the water temperature remains stable. Intelligent water heater using the STC89C52 can automatically adjust the water temperature, and the system control is achieved through the keyboard. The system can set the temperature accurately to 0.1°C and display the temperature value on the display screen. When the temperature set by the system is higher than the actual temperature, the single chip microcomputer controls the relay to power on and heat it up. When the collected water temperature is higher than the set temperature, the relay will turn off, stopping the heating of the water in the water tank. After experimental verification, it is proved that the system has sufficient stability and reliability, with the advantages of convenience, safety, and small size.
Controller Design of a Novel Interleaved Parallel Bi-Directional DC-DC Converter
Authors: Ouyang Jiayu , Wu Jun , Lin Meijin 
Published: March 2024

Abstract
To improve the dynamic performance of the output voltage of the new interleaved shunt bi-directional DC-DC converter, a double closed-loop control method of voltage and current based on fuzzy PI control is proposed. Firstly, based on the study of the operating principle and steady-state performance of the new interleaved parallel DC-DC converter, a small-signal mathematical model of the interleaved parallel bidirectional DC-DC converter with different modes is established, and based on the model, the transfer functions from duty cycle to output voltage and inductor current are derived, and accordingly, the double-closed-loop controller of the bidirectional DC-DC converter is designed. Then the design method of the fuzzy PI controller is described in detail, and the fuzzy control is applied to the voltage outer loop of the double closed-loop control so that the system can adjust the PI parameters in real time. Simulation experiments are carried out by Matlab/Simulink to compare the simulation experimental waveforms using fuzzy PI control and conventional PI control, and it is verified that the fuzzy PI control improves the output voltage response speed of the new interleaved shunt bi-directional DC-DC converter, reduces the voltage peak of the system, and reduces the overshoot.
Design and Optimization of a Highly Linear Power Amplifier with Novel Active Bias Circuit in InGaP/GaAs HBT MMIC Technology
Authors: Zheng Bangjie , Cheng Zhiqun , Le Chao , Gong Tingwei , Qian Tianle , Zhang Zhiwei 
Published: March 2024

Abstract
This paper introduces a highly linear power amplifier (PA) that utilizes a 2-μm InGaP/GaAs hetero-junction bipolar transistor (HBT) process. As communication systems evolve in complexity, the demands for the linearity and static power consumption of HBT power amplifiers are becoming more stringent. Typically, there exists a trade-off relationship between linearity and static power consumption in the design process. Hence, this paper proposes a novel active bias circuit for HBT power amplifiers, along with its layout design. The proposed active bias circuit consists of a differential pair and a current mirror structure, designed to enhance PA linearity while maintaining low quiescent current. Additionally, a novel layout structure is implemented to achieve thermal coupling between the RF transistors and the active bias, further improving PA linearity. As a result of the implementation of the proposed active bias and layout structure, the PA demonstrates high linearity in both amplitude modulation to phase modulation (AM/PM) and amplitude modulation to amplitude modulation (AM/AM) performance, while simultaneously maintaining a low quiescent current. The three-stage PA prototype achieves notable performance metrics, including a peak gain of 32.6 dB at 5.6 GHz, gain flatness of ±0.5 dB from 5.15 GHz to 5.85 GHz, and P1dB
of 32.1 dBm at a quiescent emitter current of 180 mA.
Application of Module Level Power Electronics Technology in Distributed Photovoltaic Power Generation System
Authors: Xu Libo , Ye Jun , Chen Yexin , Xu Hejun 
Published: March 2024

Abstract
Distributed photovoltaic power generation system usually adopts series wiring scheme, which has problems such as high voltage DC electrical safety risk, power mismatch of modules and maintenance management difficulty. Three schemes of module level power electronics technology are proposed, including string inverter with rapid shutdown device, string inverter with module optimizer and micro inverter. The electrical shut-off, power generation data monitoring, power optimization and inverter function characteristics of each scheme are described and compared, and the suggested application scenarios are given. In addition, typical electrical topology schemes of module level power electronic devices including rapid shutdown device, module optimizer and micro inverter are introduced.