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Zhu Jingtao,Liu Yang,Zhou Jianrong,Yang Zehua,Zhu Hangyu,Zhou Xiaojuan,Tan Jinhao,Cui Mingqi,Sun Zhijia 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.9
Neutron conversion detectors that use 10B-enriched boron carbide are feasible alternatives to 3 He-based detectors. We prepared boron carbide films at micron-scale thickness using direct-current magnetron sputtering. The structural characteristics of natural B4C films, including density, roughness, crystallization, and purity, were analyzed using grazing incidence X-ray reflectivity, X-ray diffraction, X-ray photoelectron spectroscopy, time-of-flight secondary ion mass spectrometry, and scanning electron microscopy. A beam profile test was conducted to verify the practicality of the 10B-enriched B4C neutron conversion layer. A clear profile indicated the high quality of the neutron conversion of the boron carbide layer.
Lu Zehua,Liu Chang,Liao Changjun,Zhu Jiazan,Liu Huaiju,CHENYIMING 한국CDE학회 2024 Journal of computational design and engineering Vol.11 No.1
The advancement in materials and lubrication has significantly improved the load-carrying capability of polymer gears, making them ideal for replacing metallic gears in power transmission. However, this conversion is not as simple as substituting steel with polymer; it requires a thorough redesign of the structural parameters specific to polymer gears. To enable the metallic-to-polymer conversion of gear in power transmission, a model for optimizing polymer gear systems was developed. An investigation of the accessory transmission system of a low-thrust turbofan aeroengine was conducted. A comprehensive performance index for the accessory transmission was developed using combined weighting coefficients to achieve the optimization goals including total mass, transmission efficiency, maximum transmission error, and so on. The polymer gear system developed using the proposed optimization model demonstrated a 70.4% reduction in total mass compared with the metallic gear system, as well as a transmission error decrease of over 29% when compared with polymer gear systems with standard tooth profiles. The contribution analysis results demonstrated that optimizing the tooth width, pressure angle, and addendum height of polymer gears can significantly enhance the load-carrying capacity of the polymer gear system while maximizing tooth profile flexibility.
Hui Shang,Zehua Zhu,Wenhui Zhang,Hongjun Zhou 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.5
The main process for industrial synthesis of hydrogen peroxide is to subject 2-ethylanthraquinone to cyclic hydrogenation and oxidation. Hydrogenation catalyst is one of the key techniques of anthraquinone route. A new egg-shell palladium catalyst with racshig-ring alumina supported was developed for meeting the mechanism and improving mass transformation based on the kinetics and mass transfer theory, the effects of materials feeding methods together with operating conditions on the hydrogenation efficiency were detailed. It was concluded that the egg-shell palladium catalyst developed by this research has higher hydrogenation efficiency than the commercial contrast catalysts.
Vapour–liquid–solid growth of monolayer MoS<sub>2</sub> nanoribbons
Li, Shisheng,Lin, Yung-Chang,Zhao, Wen,Wu, Jing,Wang, Zhuo,Hu, Zehua,Shen, Youde,Tang, Dai-Ming,Wang, Junyong,Zhang, Qi,Zhu, Hai,Chu, Leiqiang,Zhao, Weijie,Liu, Chang,Sun, Zhipei,Taniguchi, Takaaki,Os Nature Publishing Group UK 2018 Nature Materials Vol.17 No.6
<P>Chemical vapour deposition of two-dimensional materials typically involves the conversion of vapour precursors to solid products in a vapour-solid-solid mode. Here, we report the vapour-liquid-solid growth of monolayer MoS2, yielding highly crystalline ribbons with a width of few tens to thousands of nanometres. This vapour-liquid-solid growth is triggered by the reaction between MoO3 and NaCl, which results in the formation of molten Na-Mo-O droplets. These droplets mediate the growth of MoS2 ribbons in the 'crawling mode' when saturated with sulfur. The locally well-defined orientations of the ribbons reveal the regular horizontal motion of the droplets during growth. Using atomic-resolution scanning transmission electron microscopy and second harmonic generation microscopy, we show that the ribbons are grown homoepitaxially on monolayer MoS2 with predominantly 2H-or 3R-type stacking. Our findings highlight the prospects for the controlled growth of atomically thin nano-structure arrays for nanoelectronic devices and the development of unique mixed-dimensional structures.</P>