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Lei Gao,Feng Li,Ye Wang,Xing Mao Xiao,Peng Da Huo 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.8
Solid-state bonding of heterogeneous materials is one of the effective ways to achieve light weight. An extrusion formingprocess for Mg/Al thickness-oriented bonding sheet was carried out. Due to triaxial compressive stress in the extrusion container,the AZ31 and AA6061 billets were deformed and the bonding and forming of Mg/Al thickness-oriented sheet can berealized by this method. The observation results of the bonding position by using XRD, SEM and EDS showed that: at theforming temperature with 360–420 °C, it had a good bonding interface, and the width of the transition layer increased withthe increase of the forming temperature. The presence of brittle intermetallic compounds in the transition layer indicated thatmetallurgical bonding had occurred at the interface. Considering all factors comprehensively, when the forming temperaturewas 390 °C, the bonding quality was appropriate. Its tensile-shear strength was 42 MPa, the width of the interface transitionlayer was about 10 μm, and the microhardness was about 164.3 HV. This method provided scientific guidance and technicalreserves for green forming of Mg/Al sheets.
Ye Lei,전형필 한국운동생리학회 2022 운동과학 Vol.31 No.1
PURPOSE: Numerous studies claim that Taekwondo can effectively help obese children improve their physical fitness. In addition, Taekwondo might help prevent lifestyle diseases and metabolic syndrome caused by obesity. However, studies and reviews on the effectiveness of Taekwondo Poomsae are very few compared to those on Taekwondo Kyorugi. Based on previous reviews, this study aims to clarify the effect of Taekwondo Poomsae training on improving body composition, physical fitness, and blood composition of children and adolescents of different groups. Furthermore, the applicability of Taekwondo Poomsae training is to be determined. METHODS: Two-hundred and two studies were searched via Korea electronic databases RISS, KISS, and DBPIA from March 1 to 3, 2021, and 22 of these were included in this review. RESULTS: Our review confirms that Taekwondo Poomsae is effective in improving the physical condition of developing children and adolescents. However, we cannot assert that this sport is also an effective exercise therapy for special youth groups, such as those who are overweight, obese, or have a metabolic growth or development syndrome. CONCLUSIONS: We suggest that sports implementers, Taekwando experts, coaches, and other sport professionals provide more Taekwondo Poomsae training programs suitable for physical and physiotherapeutic exercises for different ages and groups.
( Lei Ye ),( Samantha C. Karunarathna ),( Huli Li ),( Jianchu Xu ),( Kevin D. Hyde ),( Peter E. Mortimer ) 한국균학회 2019 Mycobiology Vol.47 No.4
A survey of mushrooms was conducted in Xishuangbanna, Yunnan Province, China, in the rainy season (May to October) of 2012, 2013, and 2014, during which 16 specimens of Termitomyces were collected. Preliminary macro- and micro-characteristics, together with ITS sequence data, showed that four of the specimens belonged to a new species (Termitomyces fragilis), while the other 12 belonged to T. aurantiacus, T. eurrhizus, T. globules, T. microcarpus, and T. bulborhizus. In this paper, T. fragilis is introduced as a species new to science based on morphological characterization and phylogenetic analyses. Macro- and micro- morphological descriptions, color photographs and line drawings of the new species, and a phylogenetic tree to show the placement of the new species are provided. T. fragilis is then compared with other closely related taxa in the genus Termitomyces.
Lei Zhu,조순복,Shu Ye,Kefayat Ullah,오원춘 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.3
This paper introduces a microwave-assisted synthesis method to prepare hybrid Bi2Se3-GR/TiO2 nanocomposites, which exhibitsuperior properties over single component materials. The as-prepared composites were characterized by XRD, UV-vis absorbancespectra, SEM,TEM, EDX, and BET analyses, revealing uniform covering of the graphene nanosheet with Bi2Se3 and TiO2nanocrystals. For visible light photocatalysis of Rh.B, a significant enhancement in the reaction rate was consequently observedwith Bi2Se3-GR/TiO2 composites. The degradation rate(kapp) obtained for sonophotocatalysis was 6.8× 10-3 min-1, roughly 2.2 timesbetter than that of VL photocatalysis under higher concentrations of Rh.B. The sonophotocatalysis was faster due to greaterformation of reactive radicals as well as an increase of the active surface area of the Bi2Se3-GR/TiO2 composites. The high activityis attributed to the synergetic effects of high charge mobility and red shift of the absorption edge of Bi2Se3-GR/TiO2.
Fabrication of self-reinforcement of porous mullite ceramic using NH4F as additive from kaolinite
Lei Yuan,Jingkun Yu,Rutao Ye,Shaowei Zhang 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.4
Self-reinforcement of porous mullite ceramics containing needle-liked whiskers were fabricated from a powder mixture of kaolinite, Al(OH)3 and starch with NH4F as additive. The effects of the sintering temperature and the content of NH4F on porosity, phase composition, strength and microstructure of ceramics were investigated. The formation mechanism of needleliked mullite whiskers by in situ synthesis in ceramic body was discussed. The results indicated that lots of large aspect ratio needle-liked mullite whiskers, especially in the 15% NH4F additive sample, were observed. An interlocking structure was formed by needle-liked mullite whiskers to enhance the mechanical strength of porous mullite ceramic. And as the content of NH4F increasing, the bending strength increased. Comparing to the samples without NH4F additive, porous ceramic fabricated by adding NH4F showed a higher degree of mullitization. The formation mechanism of the needle-liked mullite in the ceramic was attributed to the reaction among NH4F and raw materials.
Lei Zhu,조순복,조정환,Shu Ye,Kefayat Ullah,오원춘 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.3
Activated carbon fiber (ACF) was modified with MnS nanoparticles to prepare MnS-ACF, and it was employed for preparationof MnS-ACF/TiO2 composites with titanium (IV) n-butoxide (TNB). The properties of MnS-ACF/TiO2 composites were characterizedby XRD, SEM, and EDX. EDX results showed the presence of C, O, and Ti as major elements and traces of the metal elementsMn and S. The photocatlytic activity was evaluated by degradation of methyl blue (MB) and methyl orange (MO) dye. Theresults demonstrated that as-prepared samples could effectively photodegrade MB and MO under UV irradiation. Subsequently,the decomposition of MB solution showed the combined effects of adsorptions by ACF and enhanced photocatalytic effect by TiO2. Finally, the photocatalytic effect increased due to photo-induced-electron absorption effect by ACF and electron trap effect by comodified MnS nanoparticles.
Lei Zhu,조선복,Shu Ye,Kefayat Ullah,Zeda Meng,오원춘 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
CoS2, CoS2–graphene and CoS2–graphene/TiO2 composite was synthesized by a facile sonochemical andhydrothermal method. X-ray diffraction, scanning electron microscopy with energy-dispersive X-rayanalysis, transmission electron microscopy, FT-IR, UV–vis and BET surface area was calculated bynitrogen adsorption were used. The FT-IR results illuminated that CoS2 and TiO2 band transfers electronsto graphene with functional groups attached. UV–vis patterns indicated that CoS2–graphene/TiO2 havegood photoinduction effects in visible light region. The photocatalytic activity of sample was evaluatedby measuring the degradation of organic pollutants such as methylene blue (MB), and industrial dyessuch as Texbrite BA-L (TBA) under visible light.
Lei Zhu,Mei Mei Peng,조광연,Shu Ye,Sourav Sarkar,Kefayat Ullah,Ze-Da Meng,오원춘 한국세라믹학회 2013 한국세라믹학회지 Vol.50 No.6
In this study, ZnSe-TiO2 composites were synthesized by a facile hydrothermal-assisted sol-gel process and characterized by nitrogen adsorption isotherms (77 K), X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis, transmission electron microscopy (TEM) and UV-vis diffuse reflectance spectrophotometry. The photocatalytic activity was investigated by decoloration methylene blue (MB), methyl orange (MO), and rhodamine B (Rh.B) in an aqueous solution under visible light irradiation. The results revealed that the photocatalytic activity of the ZnSe-TiO2 photocatalyst was much higher than that of pureTiO2. The ZnSe nanoparticles, which act as a photosensitizer, not only extend the spectral response of TiO2 to the visible region but also reduce charge recombinations.
Lei Zuo,Maode Yan,Ye Zhang 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.1
This paper studies the coverage control problems for a group of agents on a given line, in which both the unknown density function and the collision avoidance among the agents are taken into consideration. To deal with this problem, a novel adaptive line coverage control algorithm is proposed to deploy the agents. In details, the density function is used to describe the distribution of the interested information over the line. Then, an adaptive estimation algorithm is provided to approximate the density function. Comparing with the other density estimation algorithms, the estimation accuracy and efficiency of our proposed algorithm are improved by using the linear regression techniques and a group of error-correction functions. On this basis, a line coverage control scheme with parameter conditions is provided to deploy the agents without any collision. Moreover, the stability of proposed coverage system is strictly analyzed. In final, both numerical simulations and experiments are provided respectively to validate the proposed approaches.