Volume 16 Issue 7
Published on July 2025
Semiconductors play a crucial role in electronic engineering, with both fields mutually reinforcing each other to drive technological progress. In modern electronic engineering, semiconductor materials serve as indispensable foundational materials. In recent years, the continuous expansion of semiconductor materials' application scope in electronic engineering has significantly enhanced the technological level of semiconductor material preparation. Conversely, the rapid evolution of electronic engineering has increased performance demands for semiconductor materials, leading to swift iterations in their development. This paper focuses on commercially available GaN and SiC power transistors, highlighting the characteristic advantages of these two new materials through qualitative analysis based on relevant literature. It introduces the application of Silicon Carbide (SiC) in Tesla and explains the function of Gallium Nitride (GaN) in 5G communications. The findings reveal that these two materials have created new breakthroughs and possibilities for scientific and technological development. However, their practical applications are limited due to the generally cumbersome preparation processes and high requirements for experimental conditions.
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The agricultural watersheds in the karst regions of Southwest China face severe nitrate pollution, but research on its sources and transport mechanisms remains limited. This study focuses on the Mudong River watershed in Guilin, Guangxi. Water samples were collected from 2020 to 2025 and analyzed for hydrogen, oxygen, nitrogen, and oxygen isotopes as well as nitrogen concentrations, in combination with the SIAR model. Results show that total nitrogen is mainly in the form of nitrate, with δ¹⁵N-NO₃⁻ and δ¹⁸O-NO₃⁻ values ranging from -1.651‰ to 14.993‰ and 0.037‰ to 19.266‰, respectively. Nitrification dominates nitrate transformation, with soil nitrogen and animal manure/domestic wastewater as the primary sources. This research provides a scientific basis for nitrate pollution control in agricultural watersheds of karst regions.
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With the acceleration of urbanization and the increasingly severe shortage of land resources in China, the development of underground space has emerged as a key strategy to alleviate urban development conflicts. It plays a vital role in mitigating the “metropolitan maladies” and optimizing the spatial layout of national territory. However, various issues in underground space development have become increasingly prominent, including inadequate planning systems, poor functional coordination, pronounced safety risks, and fragmented management mechanisms. Moreover, China's urban underground space development remains at an early stage, with a low degree of integration between above-ground and underground spaces, and a relatively weak resilient disaster prevention system. This study analyzes key factors affecting the effectiveness of underground space development and proposes targeted strategies to enhance overall outcomes. These include improving institutional frameworks, promoting the integrated application of BIM and GIS technologies, constructing digital platforms, and facilitating green and low-carbon transitions. The research also offers theoretical insights to support the refinement of the Regulations on the Development and Utilization of Urban Underground Space. In the future, technical approaches can be further validated through integration with smart city pilot initiatives.
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