http://scholars.ntou.edu.tw/handle/123456789/7 2026-04-27T13:34:01Z 2026-04-27T13:34:01Z Wang, Weibing Kai, Wu Yang, Tao Chen, Da Zhang, Jixun Luan, Junhua Yang, Chin-Hua Wang, Bo Zhang, Meng Kai, Ji-jung http://scholars.ntou.edu.tw/handle/123456789/26536 2026-03-12T03:49:05Z 2026-01-01T00:00:00Z

標題: The effect of Ta segregation on the corrosion resistance of the Fe₃₀Ni₃₀Cr₃₀Al_10-xTa_x high entropy alloys in lead-bismuth eutectic at 800 °C 作者: Wang, Weibing; Kai, Wu; Yang, Tao; Chen, Da; Zhang, Jixun; Luan, Junhua; Yang, Chin-Hua; Wang, Bo; Zhang, Meng; Kai, Ji-jung 摘要: Lead-bismuth eutectic (LBE)-cooled reactors were considered promising candidates for Generation IV nuclear reactor systems due to the favorable physical properties and exceptional safety performance of LBE. This study investigated the role of Ta in enhancing the corrosion resistance of Fe30Ni30Cr30Al10-xTax high-entropy alloys (HEAs) exposed to static LBE at 800 degrees C. Multiscale characterization revealed that Ta-free HEA (0Ta-HEA) formed an outer FeCr2O4 spinel layer, which permitted significant LBE penetration and inward diffusion of oxygen within the first 48h. In contrast, the 2 at.% (in atomic percent) Ta HEA (2Ta-HEA) exhibited superior corrosion resistance, with corrosion depth reduced by similar to 40 %. The low solubility of Ta in LBE led to its rapid saturation and local precipitation, which, in turn, formed protective phases comprising a mixed layer of Al2O3, Cr-rich phase, and FeCr phase. After 168 h of exposure, the competitive mechanism between dissolution and oxidation dominated in the 2Ta-HEA. The mixed layer formed during the initial stage of corrosion gradually evolved into a double-layered scale, consisting of an outer Ta-rich LBE layer and an inner layer of Cr2O3 and FeCr2O4. The discontinuous Al2O3 only inhibited the penetration of LBE at the initial stage of corrosion. These findings highlighted Ta as a strategic alloying element for mitigating LBE corrosion in nuclear applications, stabilizing interfaces, and minimizing elemental loss.

2026-01-01T00:00:00Z Liang, Yuan-Chang Lu, Rui-Ling http://scholars.ntou.edu.tw/handle/123456789/26535 2026-03-12T03:49:05Z 2026-01-01T00:00:00Z

標題: Charge transport modulation in photoreduction-derived metal-polymer/ oxide hybrid interfaces for bifunctional performance 作者: Liang, Yuan-Chang; Lu, Rui-Ling 摘要: The study focused on developing porous ZnO nanosheets through a low-temperature hydrothermal method, followed by spin-coating with PANI and adjusting the photoreduction time to create Ag-particle-decorated ZPA composites. The objective was to examine how modulation of the interfacial structure influences both photoelectrochemical and antibacterial performance. As an n-type semiconductor, ZnO encounters challenges such as surface carrier recombination and photocorrosion. However, the introduction of PANI facilitates the formation of a p-n heterojunction, which effectively promotes the separation of charge carriers. Additionally, PANI enhances the absorption of visible light and improves conductivity, thereby increasing interfacial transport efficiency. Controlled photoreduction generates silver particles that form Schottky contacts with the ZnO/PANI composite, further enhancing visible light absorption, electron trapping, and carrier transport. The ZnO/PANI/Ag composite exhibits significant antibacterial activity against both Escherichia coli and Staphylococcus aureus, thereby achieving robust photoelectrochemical performance alongside effective antibacterial functionality. This study underscores the importance of interfacial engineering in the development of multifunctional photoelectronic materials for antibacterial applications.

2026-01-01T00:00:00Z Xu, Wen-Qi Wang, Sheng-Ping Lin, Chih-Yu Chiang, Wei-Chuan Kitakado, Toshihide http://scholars.ntou.edu.tw/handle/123456789/26534 2026-03-12T03:49:04Z 2026-01-01T00:00:00Z

標題: Spatio-temporal dynamics for dolphinfish (Coryphaena hippurus) in the waters around Taiwan: Implications for stock assessment and fisheries management 作者: Xu, Wen-Qi; Wang, Sheng-Ping; Lin, Chih-Yu; Chiang, Wei-Chuan; Kitakado, Toshihide 摘要: Understanding the spatio-temporal dynamics of dolphinfish (Coryphaena hippurus) is essential for effective stock assessment and fisheries management. Owing to its migratory nature, rapid growth, and short lifespan, the species requires management approaches that account for spatial and temporal variability. In this study, two spatio-temporal modelling frameworks, VAST and sdmTMB, were applied to longline fishery logbook data collected in the waters around Taiwan from 2011 to 2023. Standardised indices of relative abundance were estimated using an area-weighted approach that accounted for both fished and unfished regions. Cluster analysis was conducted to classify fishing strategies based on species composition, revealing a dominant dolphinfishtargeted cluster concentrated in the eastern offshore region. Both spatio-temporal models detected consistent seasonal patterns, with peak abundance in the second quarter and a decline in the third, aligning with known migratory behaviour and oceanographic influences. Spatial hotspots were identified primarily in the northeastern waters influenced by the Kuroshio Current. While general agreement was observed between the models, sdmTMB produced higher spatial contrast and slightly greater abundance estimates in the early years. Differences in model structure, spatial resolution, and data coverage were found to influence predictive outcomes. Limitations regarding logbook data quality, spatial bias, and the absence of environmental covariates were acknowledged. Nevertheless, the results demonstrate the utility of spatio-temporal modelling in deriving robust abundance indices and identifying biologically and operationally significant fishing grounds that represent key habitats and high-effort zones for dolphinfish fisheries in the northwestern Pacific. These findings provide a strong basis for integrating spatial dynamics into stock assessments and support the development of adaptive, spatially explicit management strategies in the western Pacific.

2026-01-01T00:00:00Z Liang, Yuan-Chang Chen, Shang-Hao Chang, Kun-Hsien http://scholars.ntou.edu.tw/handle/123456789/26533 2026-03-12T03:49:04Z 2026-01-01T00:00:00Z

標題: Engineering Ag-Bi₂O₃/WO₃ nanocomposites with porous morphology for photocatalytic enhancement 作者: Liang, Yuan-Chang; Chen, Shang-Hao; Chang, Kun-Hsien 摘要: We successfully synthesized Ag-Bi2O3/WO3 composites with a porous sheet morphology using chemical bath deposition and sputtering methods. Structural and compositional analyses indicate that varying the sputtering time of silver (Ag) nanoparticles results in their successful decoration onto the Bi2O3/WO3 composites. The Ag-Bi2O3/WO3 composites demonstrated superior electrical and photocatalytic properties compared to both the Bi2O3/WO3 composite and the WO3 underlayer film. This can be attributed to the Schottky barrier and photo-induced S-scheme charge transfer mechanism in the Ag-Bi2O3/WO3 composites. The bending of the energy bands at the Bi2O3/WO3 composites interface makes Bi2O3/WO3 composites a S-scheme charge transfer mechanism under irradiation. This successfully and effectively retains photo-generated carriers with a strong redox ability for photodegradation towards organic dye. Furthermore, Ag nanoparticles promote the visible light absorption ability and transfer of photo-generated electrons in the Ag-Bi2O3/WO3 composite system, further improving the photoactive performance. The current research provides the design of metal particle-decorated porous composites for photocatalytic applications.

2026-01-01T00:00:00Z