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- 저자 : Zhongfei Liu (검색결과 3 건)
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Zhongfei Liu,Jiangtao Yuan,HUI ZHANG,Kuangwei Xiong,Shaowei Jin,Peihong Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.1
In this paper, the MOFs-derived carbonaceous ZnO and RGO (carbonaceous ZnO/RGO) composites have been prepared by the wet chemical method and carbonization process. The as-prepared products are characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy (TEM), Raman spectra, thermogravimetric (TG) analysis and X-ray photoelectron spectroscopy (XPS). The electromagnetic parameters of carbonaceous ZnO/RGO composites are investigated by the vector network analyzer. The results exhibit carbonaceous ZnO/RGO composites have a maximum absorption of - 37.12 dB at 6 GHz with thickness of 3.5 mm and the effective absorption (below -10 dB) bandwidth is up to 1.92 GHz (from 5.28 to 7.2 GHz). Thus, the carbonaceous ZnO/RGO composites have great potential in the field of electromagnetic wave absorption.
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Design of mechanical coxa joints based on three-degree-of-freedom spherical parallel manipulators
Yanbiao Li,Zhenlin Jin,Zhongfei Wang,Ming-sheng Jin,Yi Liu 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.1
We addressed the issue of the design of mechanical coxa joints based on three-degree-of-freedom spherical parallel manipulators using the parameter statistics optimum method based on index atlases. The coxa joints have the advantages of high payload, high accuracy, and good technological efficiency. The first step of the design and prototyping used in this paper develops the direct and inverse displacement equations from the layout feature of the mechanical coxa joints. Then, the shapes of a constant-orientation workspace of the mechanical coxa joints are described, and the effects of the design parameters on the workspace volume are studied quantitatively. The next step deals with the graphical representation of the atlases that illustrates the relationship between performance evaluation index and design parameters based on the kinematics and torque analysis of the mechanical coxa joints. Finally, the geometric parameters of the coxa joints are obtained by the parameter statistics optimum method based on the index atlases. Considering assembly conditions, the design scheme of the mechanical coxa joints is developed, which provides a theoretical basis for the application of the mechanical coxa joints.
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Ying Tang,Shuyan Yang,Wendan He,Lei Liu,Zhongfei Zhang 한국섬유공학회 2020 Fibers and polymers Vol.21 No.6
Chinese gallnut (Galla chinensis) is rich in hydrolyzable tannins, which, when mordanted with ferrous ions,produces intense black color on keratinous fiber and makes it a desirable natural hair dye in Asian countries. However,extracted tannins from Chinese gallnut are susceptible to chemical degradation by physicochemical factors (heat, UV, andhigh pH) that limited the utilization and commercialization of this plant colorant in color cosmetics. Hence, this study wasaimed to improve the storage and application stability of Chinese gallnut extract by spray-drying microencapsulation. Different combinations of maltodextrin (MD) and gum arabic (GA) were used as encapsulating agents and the effects on theencapsulation efficiency, morphology, physicochemical properties, in vitro toxicity, and stability were investigated. Theresults showed that an increase of MD proportions in the wall matrix resulted in the production of more spherical shapedparticles with larger size, decreased bulk density, and improved solubility in water. Furthermore, microcapsules covered withMD alone showed the maximum stability with respect to heat, UV, and formulation at alkaline pH. When applied for dyeingof human gray hairs, intense black color could be achieved by using the MD-covered microcapsule formulations and thedyeings are stable to multiple washings and simulated sunlight. Therefore, this study examines a promising strategy forstabilizing tannin-rich extract from Chinese gallnut while maintaining its dyeing efficiency, which will in turn promote itsutilization in hair coloring cosmetics.
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