bluuebunny/crossref_metadata_2025_split huggingface dataset:
Spatial and temporal characteristics and weather situation analysis of summer monsoon rainstorms in Yangjiang
Authors: Huang Xiaodan 
Published: August 2024

Abstract
The annual average rainfall of summer monsoon rainstorms in Yangjiang is highest in the southeast, decreasing towards the wings. Rainfall most frequently occurs in the early morning and around noon in June, with the western region experiencing the peak slightly earlier than other areas. Short-duration intense rainfall in the south occurs most frequently between 02:00 and 08:00, while in the north, it is more common between 08:00 and 14:00; the 6-hour accumulated rainfall ≥50mm most frequently occurs between 02:00 and 08:00. The weather situation conducive to monsoon rainstorms involves the stability of the South Asian high pressure at 200hPa over the Indochinese Peninsula, with Yangjiang at 500hPa ahead of the southern trough. During the early morning, the southwest monsoon strengthens from 925hPa over the northern Bay of Bengal to the northern South China Sea, pushing northward to Yangjiang’s land, creating the atmospheric conditions for monsoon rainstorms. Moisture primarily enters from the Indochinese Peninsula through the South China Sea, gradually increasing at night and reaching its peak from late night to early morning. The moisture channel and convergence height are below 700hPa. Atmospheric upward motion extends from the mid-to-upper levels to near the surface in the early morning, with the strong center moving from south to north.
Industrial and biomedical applications of slippery liquid-infused porous surfaces
Authors: Cao Zhilin , Dong Runjie , Li Jialu 
Published: August 2024

Abstract
Slippery liquid-infused porous surfaces (SLIPS) are biomimetic interface materials that consist of a porous structure or polymer network substrate with a high specific surface area and a perfused liquid lubricant. This surface has an extremely low coefficient of friction and a high degree of antifouling property, which can effectively repel various liquids, oils, ice, biofilms, etc. The tunable performance of SLIPS endows it with promising application prospects in various fields, thus emphasizing the importance of designing diverse SLIPS materials tailored to specific application scenarios in the future. However, owing to the inherent fluid properties of lubricating oil, the surface may encounter challenges associated with lubricant depletion during practical utilization. This review paper focuses on elucidating the principles, design strategies, and fabrication techniques employed for developing SLIPS materials in anti-ice applications, drag reduction applications, and biomedicine. Furthermore, a comprehensive summary of challenges encountered by SLIPS in different domains is provided along with potential avenues for future research to improve the stability and durability of SLIPS. In conclusion, SLIPS shows significant potential for diverse applications, yet necessitates comprehensive research to address its inherent challenges and extend its versatility and functionality across various domains.
Design of 2.5-3.3 GHz high-precision compact digital phase shifter
Authors: Zhan Huawei , Zhang Tianhao , Pei Xinyu 
Published: August 2024

Abstract
A 6-bit MMIC digital phase shifter, designed using a 0.5 μm GaAs pHEMT process, has been developed to enhance the search capability of phased array systems for targets. The chip structure of the phase shifter is well-designed, and the improved embedded topology of the 45° and 90° phase shifting units effectively reduces the overall insertion loss. To reduce the chip size, the phase shifting units with smaller layouts of 5.625°, 11.25°, and 22.5° are combined, greatly reducing the chip area. The results show that within the frequency range of 2.5-3.3 GHz, the input and output VSWR is less than 1.38, the insertion loss is less than 4.3 dB, the root mean square phase error of the phase shifting state is less than 1.43°, and the absolute value of the amplitude fluctuation for different states is less than 0.52 dB. The compact chip structure measures 2.45 mm×1.08 mm.
A buck converter with adaptive on-time control based on ripple compensation
Authors: Gong Yunyang , Dai Haojie , Chen Haichuan , He Jiangping , Xia Yankun 
Published: August 2024

Abstract
This paper proposes a novel adaptive on-time control Buck converter based on ripple compensation. By superimposing high-sampling-precision inductor current ripples on the feedback loop, the ripple of the feedback voltage is enhanced. This approach effectively addresses subharmonic oscillations observed in ripple-controlled Buck converters, particularly when the equivalent series resistance (ESR) of the output filter capacitor is low. The proposed control method enhances system stability and exhibits excellent transient response characteristics. Simulations using Simplis demonstrate high accuracy in the output voltage (with ripples as low as 2mV). The comparative analysis establishes the superior merit of this design.
Multi-Agent deep reinforcement learning based task offloading and caching in computing power network
Authors: Li Weidong , Cai Yunlong , Wen Wushao 
Published: August 2024

Abstract
Computing power network (CPN) can alleviate the resource bottleneck in mobile edge computing (MEC). In this paper, we investigate the caching-assisted CPN system for task offloading. A combination of policies such as task offloading and caching is considered to reduce the energy consumption of the system under the condition of meeting a certain delay. Besides, we propose an advanced deep reinforcement learning (DRL) algorithm called Request Sensitive Multi Agent Soft Actor-Critic (RS-MASAC) algorithm to achieve minimal system energy consumption by obtaining the optimal policy. Simulation results show that our proposed algorithm has better performance than baseline algorithms.
Research on key technologies for automatic planning of multiple links on a single node
Authors: Li Chongxiao , Li Chunfeng , Dong Yanlei , Li Zhuo 
Published: August 2024

Abstract
Aiming at the problems of slow speed and low efficiency existing in the traditional manual planning method of multiple links on a single node, which cannot fully meet the rapid deployment needs of communication nodes, this paper studies and puts forward two automatic planning technologies of single-node-multi-link based on shortest distance priority and minimum angle priority. This is an automatic planning technology that uses the shortest distance priority to determine the pairing relationship between the multi-scattering antenna of the local communication node and the far-end scattering antenna. It aims to solve the issue of cross-redundancy of distance in wrong planning. Automatic planning technology of single-node-multi-link based on minimum angle priority simulates manual planning mode. Using the concept of minimum angle priority, the pairing relationship between the multi-scattering antenna of the local communication node and the remote scattering antenna is determined. This is achieved by calculating and optimizing the minimum angle of two rays that are formed from the origin of the coordinate system of the local communication node to the local scattering antenna and the remote scattering antenna, respectively. Comparative analysis and simulation experiments prove that the two key technologies proposed in this paper can not only effectively avoid the problem of mutual interference between multiple scattering antennas in this node but also improve the efficiency of multi-link planning on a single node.
Comparative study of control moment gyroscopes’ steering laws
Authors: Gamal Haytham M , Desouky Mohammed A A , Ashry M , Esmat Hussien Ahmed 
Published: August 2024

Abstract
The Control Moment Gyroscope (CMG) is superior to other attitude actuators in terms of torque amplification capabilities. Its operating margin is hampered by the singularity problem, which needs the proper selection of a steering law. This study analyses five steering laws for avoiding or escaping different types of singularity; pseudoinverse, pseudoinverse with the null space approach, singularity robust (SR) inverse, generalized SR inverse, and new generalized SR inverse. This analysis measures the effectiveness of these laws in terms of attitude performance and command generation. Simulation results are provided to show the performance of each steering law, with an emphasis on the benefits and drawbacks of each steering law.
CFD Study of Novel Vortex Finder Pressure Drop Holes to Enhance Cyclone Separators Performance
Authors: Abbass Nourhan A. , Elsayed Khairy , Elnady Abdelrady O. , Elshaer Yasser I. 
Published: August 2024

Abstract
Gas cyclones are widely employed for the removal of dust and suspended particles from gases, but they encounter challenges related to pressure drop (ΔP) and separation efficiency (ηSep). In addressing these issues, this study explores the impact of incorporating vortex finder pressure drop holes (VFPDH) in various configurations—single column, double columns, three columns, and four columns of holes—each column containing 15 holes. These holes are positioned equally distributed in clockwise order in the z-y plane starting from positive z to negative y-axis equally distributed. Computational fluid dynamics (CFD) analyses were conducted on 15 cases through different configurations, considering steady flow, isothermal properties, and incompressible turbulent flow with 8.809 m/s inlet velocity. The introduced modifications, involving the strategic use of VFPDH, lead to a significant reduction in (ΔP). Specifically, the single column of holes exhibited a remarkable 21% reduction in pressure drop compared to the case without holes. In contrast, the case with four columns of holes achieved a more modest 1.8% reduction. This underscores the substantial influence of VFPDH on the pattern of flow and overall gas cyclones performance. The study provides valuable insights into optimizing gas cyclone design for enhanced efficiency and reduced (ΔP), contributing to advancements in industrial dust and particle separation systems.
Heat pipe solar collectors: A Review
Authors: Radwan Ahmed. M. , el-wteidy Ahmed , Rashad Ahmed , Hassan Mohamed S. 
Published: August 2024

Abstract
In today’s world, the consumption of energy is quickly growing, and the exhaustion of non-renewable energy sources poses a significant risk to the entire human race. The importance of renewable energy sources emerged as a result of this, and solar energy is currently considered to be among the most promising and significant sources of clean and renewable energy. There has been a significant amount of work done in the field of solar radiation harvesting in order to make the most of it. This was accomplished by substituting the standard solar collectors, which are lacking in certain elements of performance and have a lower efficiency, with a modified solar collector that is superior to the normal collectors. Among the many modifications that can be made to the solar collector, the heat pipe is particularly significant. This review will present a variety of studies on the modification of heat pipe solar collectors (HPSCs) construction and integration within the systems, as well as an analysis of the performance enhancements that were made to it. Additionally, we provide a wide range of applications that make use of solar collectors that are shaped like heat pipes. In conclusion, we offered some suggestions for potential developments in the field of heat pipe solar collectors with regard to future trends.
Bulbous Bow Shapes Effect on Ship Characteristics: A Review
Authors: Mokhtar Abo El-Ela Ahmed , Mostafa Hussien Mohamed , Mohamed Elhadad Alaaeldeen 
Published: August 2024

Abstract
Hydrodynamic optimization is an effective and robust design method that is indispensable in ship hull form performance. Marine engineering and naval architecture have displayed significant interest in integrating bulbous bows on combatant ships. This review aims to gather and assess the existing knowledge regarding the effects of bulbous bow shapes on the hydrodynamic characteristics of combatant ships in terms of historical background, design principles, and impacts of bulbous bow shapes on ship resistance, ship motion in seaways, squat, and seakeeping performance. The review evaluates the effects of bulbous bow shapes on hull hydrodynamics using computational fluid dynamics (CFD), model testing, and full-scale experiments. The text delves into the complexities of improving hull shape and how the bulbous bow design interacts with many operational factors like draft, speed, and sea conditions. This research offers scholars, naval architects, and marine engineers a comprehensive insight into the intricate effects of bulbous bow shapes on combatant ship performance. It aims to consolidate current material to enhance our comprehension of ship design and operation by identifying knowledge gaps and suggesting future research areas.
Optimization and improvement method for complementary power generation capacity of wind solar storage in distributed photovoltaic power stations
Authors: Lin Weixiu , Li Feng , Gong Junjie , Yu Lingwei , Lu Jun , Zhang Bin , Wang Ji , Wu Xutao , Ni Lei 
Published: August 2024

Abstract
With the increasing energy demand, distributed photovoltaic power generation and wind energy are used as new energy sources for sustainable development. To solve this problem, this paper optimizes and improves the distributed photovoltaic power station. This project will fully consider the complementary relationship between photovoltaic, wind and energy storage, and optimize the charging and discharging strategy of energy storage batteries. An optimal scheduling method based on fuzzy C-mean clustering is proposed to improve the power supply reliability and energy utilization of distributed photovoltaic power generation systems. The test results show that the output of the wind turbine and solar cell designed in this paper is quite high, and has good tracking ability. The research results of this project will provide an effective way to efficiently utilize wind energy and wind energy resources in distributed photovoltaic power stations.
Optimal dispatching of distributed photovoltaic system based on operating costs
Authors: Zhang Xirun , Li Siwei , Yu Long , Zhang Shuai , Du Yue 
Published: August 2024

Abstract
This article investigates the method of distributed photovoltaic optimal dispatching method. The goal is to minimize the operating costs of the distribution network system by coordinating electric heating and distributed energy storage when adjusting the demand-side resources of the distribution network. The analysis is conducted on the operating costs of the distribution network system under different penetration rates of photovoltaics to further promote the accommodation capacity of distributed photovoltaics. The research results show that when the penetration rate of photovoltaics is less than or equal to 90%, only electric heating needs to participate in the accommodation capacity of distributed photovoltaics; when the photovoltaic penetration rate exceeds or equals 100%, both distributed energy storage and electric heating need to participate in the accommodation capacity of distributed photovoltaics. As the penetration rate of photovoltaics gradually increases, the total operating costs and purchased electricity costs show a downward trend. When the penetration rate of photovoltaics increases from 70% to 100%, the network loss costs decrease first, but when the penetration rate reaches 110%, photovoltaics cannot be completely integrated, leading to an increase in network loss costs and dispatching costs. This method fully utilizes the flexible adjusting capabilities of electric heating loads and distributed energy storage, promotes the accommodation capacity of distributed photovoltaics, and improves the economic efficiency of distribution network operation.
Method for constructing typical operation scenarios in power systems considering spatiotemporal correlation of renewable energy generation
Authors: Bai Bin , Li Xing , Zhao Dongning , Li Jipeng , Han Mingliang 
Published: August 2024

Abstract
The proposed article focuses on developing a methodology for constructing typical operational scenarios in power systems considering the spatiotemporal characteristics of new energy output. The integration of new energy sources on a large scale into power systems can lead to issues such as line congestion and supply-demand imbalances. To support the planning and scheduling of future high-capacity power systems, this paper introduces a method that accounts for the spatiotemporal characteristics of new energy outputs. The method begins by proposing a spatiotemporal fusion-based multi-head attention model for generating new energy output scenarios. This model employs multi-head attention mechanisms to extract the spatiotemporal characteristics of new energy outputs, eliminating redundancy in the feature data. The processed spatiotemporal feature information is then transferred to a gated feature fusion model for integration, using an encoder structure based on Long Short-Term Memory (LSTM) to generate new energy output scenarios. The paper, by means of an advanced Fuzzy C-Means (FCM) clustering algorithm, identifies typical scenarios of net energy output. Subsequently, the proposed method’s efficacy and precision are confirmed through simulation analysis with real data from a certain area.
Simulation analysis of overvoltage caused by grounded short circuit in the collection system of far-offshore wind farms
Authors: Cheng Wenjing 
Published: August 2024

Abstract
As the distance from the shore of offshore wind farms increases, MMC-HVDC technology is gradually gaining attention in its grid connection schemes. A broadband electromagnetic transient model of offshore wind farms with a total capacity of 800 MW connected to the grid via a flexible direct current transmission system is developed. After three types of grounded short circuit faults occur at different fault positions within the power collection system, the characteristics of overvoltage are obtained and they are analyzed on the basis of considering the low voltage ride-through capability of the direct-drive permanent magnet wind power generator. Combining the two factors of range and amplitude, the results show that the overvoltage phenomenon is the most serious when a two-phase grounded short circuit occurs at the converging busbar, which can be the focus of the study when setting up overvoltage protection.
Chronological DC transmission expansion planning considering new energy and load uncertainties
Authors: Wang Huaidong , Luo Long , Li Keyu , Xu Chongshan , Dong Jizhe 
Published: August 2024

Abstract
The integration of renewable energy into the grid and the expansion of new loads have significantly increased the uncertainty of the power system, which has brought many new challenges to power system planning. Hence, it is necessary to establish a transmission expansion planning model that adapts to future development to improve the economic benefits of power grid planning. This paper proposes a chronological DC transmission expansion planning method for new energy sources, such as wind and solar energy, considering the time characteristics of source loads. First, the method establishes a chronological DC transmission expansion planning model by simulating long-term grid operations. Among them, the objective function aims to minimize the sum of investment costs and power generation operating costs related costs. Secondly, to simulate unit operation, a loop optimization modeling method is used to optimize the model structure. Finally, simulation analysis is conducted using the improved Garver’s 6 bus system under random planning scenarios as a basis for comparison. By comparing various scenarios, it is concluded that the proposed chronological DC transmission expansion planning can provide a more economical solution than non-chronological planning. This helps ensure that the system operates cost-effectively under uncertain source and load scenarios while enhancing the integration capabilities of wind and solar power generation.
Parameter identification of photovoltaic current loop parameters based on parameter separation
Authors: Wang Haoyuan , Jia Ke , Jiang Yinying , Zhang Yang 
Published: August 2024

Abstract
Accurate control parameters are the basis for analyzing the fault characteristics of PV, but due to technical confidentiality reasons, equipment manufacturers do not provide accurate parameters, so they need to be identified. This paper aims to solve the problem of poor accuracy of the integration coefficient identification of a current loop with low sensitivity by proposing a parameter identification method for a photovoltaic current loop based on parameter separation. By analyzing the current response of the fault and fault recovery stages, the scale coefficient kp
and the integration coefficient ki
are separated and identified separately. Finally, a simulation system was built on the PSCAD/EMTDC platform, and the validity of the method was verified by using the simulation data.
Design and implementation of software modularization in T-type three-level inverter
Authors: Ding Qingshu , Dou Zechun , Chen Yanping , Fu Hangjie , Wang Jiayi 
Published: August 2024

Abstract
This paper addresses the issues of logical allocation state constraints, invalid state switching, and program redundancy in the software design process of the signal processor in the T-type three-level inverter. It combines the importance and advantages of modular thinking in software design to propose a solution method for software modularization based on functional analysis and hierarchical module division. The article presents simulation tests and experimental results of the software modularization of the T-type three-level inverter implemented based on FPGA/CPLD chips, validating the feasibility and effectiveness of this design approach.
Coordinated operation optimization strategy for multiple microgrids considering uncertainties in renewable energy output
Authors: Zhang Weizhong , Zhang Yuchen , Gu Ping , Yang Pei , Chen Yahua , Zheng Siqi , Li Kunyang 
Published: August 2024

Abstract
In the process of constructing a new power system with a focus on new energy sources, microgrids will be vigorously developed as an effective means of accommodating renewable resources. The synergistic operation of multiple microgrids, merging into a multi-stakeholder framework, is a method to strengthen the overall effectiveness of the system. However, existing Nash bargaining models consider relatively fewer influencing factors. To enhance the reliability and economic viability of microgrids, this paper effectively proposes a model that combines Nash bargaining with two-stage robust optimization. Specifically, the optimization model is divided into two stages. In the first stage, equipment configuration is optimized with the objective of system economy. In the second stage, uncertainties arising from renewable energy sources are considered. Subsequently, the two-stage robust model utilizes C&CG to obtain energy exchange values between microgrids. The Nash bargaining model is then addressed using the ADMM algorithm. Finally, through case simulations, the improvement in the benefits of different microgrids is verified to be in the range of 13% to 24%.