Volume 9
Published on July 2024The rational design of a grounding grid is a crucial prerequisite for ensuring the safe and reliable operation of mobile substations. This paper discusses the design of the grounding grid for mobile substations from the perspective of standardized design, aiming to minimize on-site construction and enable rapid deployment. It introduces a type of grounding ring network design that can ensure the entire equipment forms a reliable equipotential grounding, thereby enhancing the operational reliability of mobile substations.
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Based on the concept of fishery-solar complementary systems, floating photovoltaic (PV) power stations have garnered significant attention in the power industry due to their minimal land use, high power generation efficiency, and improved water quality. However, irregular water level changes and surface disturbances caused by wind or human activities increase the difficulty of maintaining long-term stable operation. This paper, relying on a specific project, thoroughly analyzes and designs the technical scheme for a 35kV floating PV power station. It delves into the design of the floating island platform, anchoring system, shock absorption between the island and equipment, and the overall layout of the power station. These findings provide valuable references for the design, manufacturing, construction, and operation of other floating PV power stations.
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This paper proposes a transient thermal analysis model for a nitrogen-cooled cryogenic system used in superconducting electromagnetic suspension magnets. First, the structural parameters of the nitrogen cryogenic system and the internal high-temperature superconducting magnet are detailed. Subsequently, temperature change simulations during the system's cooling process using a cryocooler, as well as during the cooling and nitrogen-insulation process, were conducted using COMSOL software. Finally, simulations of the temperature variations during the system's offline operation were performed. This study provides valuable references for the design and optimization of nitrogen-cooled cryogenic systems.
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In the evolving landscape of the Internet of Things (IoT) home monitoring systems, this paper addresses the pressing privacy challenges and policy implications, highlighting the dual threats of sophisticated cyber-attacks and cloud-based vulnerabil- ities. We advocate a harmonized approach integrating technical solutions with regulatory frames to counter these issues. Our research systematically evaluates existing security mechanisms and introduces an innovative framework that blends advanced encryption techniques, robust data management practices, and comprehensive policy solutions to enhance IoT security. Central to this framework is a collaborative engagement model that brings together the efforts of legislative bodies, service provision entities, and the end-user community, ensuring a dynamic user- centric security posture against emerging threats. This study con- tributes a scalable, user-centric security model that significantly advances the discourse on IoT privacy and security, addressing the unique demands of IoT environments.
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Semantic segmentation of remote sensing images plays a crucial role in various fields, such as disaster assessment, forestry measurement, and environmental monitoring. This study conducts a bibliometric analysis to investigate the research trends and development of semantic segmentation in remote sensing from 1981 to 2024. Utilizing the Web of Science Core Collection database, we retrieved representative literature data and analyzed the publication trends, main source journals, institutional cooperation, and keyword co-occurrence networks. The results show that the number of publications in this field has increased significantly since 2000, with an exponential growth pattern. Remote sensing is the most active research topic, followed by imaging science, photographic technology, and electrical and electronic engineering. The analysis of institutional cooperation reveals that Chinese research institutions, such as the Chinese Academy of Sciences and Wuhan University, play a leading role in this field and maintain close collaboration with research institutions worldwide. The keyword co-occurrence network analysis demonstrates the evolution of research focus from basic remote sensing and image processing techniques in the early stage to advanced image processing algorithms in the middle stage and deep learning and neural network technologies in the recent stage. The findings provide valuable insights into the current status and future trends of semantic segmentation in remote sensing, highlighting the importance of international cooperation and interdisciplinary exchange in driving technological innovation.
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This paper presents a simulation analysis of the switching characteristics of a thermal control superconducting switch used in high overload electromagnetic suspension trains. A two-dimensional axisymmetric model was established using superconducting tape encapsulated in non-copper-plated stainless steel. Simulation analysis of thermal control switch heating and quenching was performed in the absence of an external magnetic field. The simulation results show that the switching resistance is 4Ω.
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Steam explosion is an effective pretreatment method for the thermochemical conversion of biomass and an efficient way to produce sugars and fuels from lignocellulose. It breaks down the recalcitrant and complex structures in biomass, which are then converted into substances such as methane and fermentable sugars, and has great potential to mitigate global oil depletion and the threat of climate change. This review evaluates the effect of steam explosion temperature, dimension pressure time, and additive type factors on the pretreatment effect of the steam explosion method. The changes in the content and physical structure of the components in the treated biomass are also explored. The advantages and disadvantages of this means for the subsequent process and its application in industrial production are analyzed in depth to provide technical reference for steam explosion in the preparation of biomass from lignocellulose.
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This paper introduces the electromagnetic design process for high-temperature superconducting (HTS) magnets used in electrodynamic suspension (EDS) systems. First, the winding process and detailed parameters of the magnets are described. Then, based on the full-field angle characteristic method, the critical current of the magnets is evaluated and the operating current is determined. Finally, the magnetic field distribution and charging delay of the magnets are assessed based on the design results. This paper provides a reference for the electromagnetic design of superconducting electromagnetic suspension magnets.
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. In the fields of GPU and AI chip design, the frequent read and write operations on the color buffer data (ARGB), which are intensive in graphical and image access, significantly impact performance. There is a need for applications that require random access and only read small images once. To address this situation, this paper proposes an algorithm with lower modeling complexity, yet achieving near-complex implementation results, along with its FPGA implementation method. Through actual testing on multiple images, the average lossless compression rate reached 40.3%. With hardware acceleration, the execution efficiency of the algorithm was further improved, ensuring both compression rate and speed, thus confirming the effectiveness of the algorithm.
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To enhance the real-time performance of image processing, effectively reduce video transmission bandwidth and storage space, and improve transmission efficiency, a real-time image processing system was designed using a Field Programmable Gate Array (FPGA). The system is mainly divided into image acquisition, image processing, and image display subsystems. Images are captured using a camera module and transmitted to the image processing module for processing, and finally displayed via an HDMI monitor. Measurements indicate that the system has strong real-time performance, low power consumption, and high portability, making it valuable in fields such as surveillance and security, medical imaging, and industrial automation.
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