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Effect of Al on the Microstructure and Mechanical Properties of Mg–Sn–Ca–Mn Wrought Alloy
Yun Feng,Yuanyuan Yang,Zongqi Xiao,Xianglong Meng,Guorong Zhou,Jinfeng Leng,Xinying Teng 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.6
Mg–Sn–Ca–Mn–xAl (x = 0,1.5 wt%) alloys with ultra-fine recrystallized grains were prepared by conventional extrusion(400 °C, 0.5 mm/s). Effects of aluminum (Al) on mechanical properties and microstructure of the Mg–1Sn–1Ca–0.5Mn(wt%) alloy were systematically investigated. By the addition of 1.5 wt% Al, the yield strength of the as-extruded alloysignificantly increased from 183 to 237 MPa. The as-cast alloys show a dendritic structure consists of α-Mg, (Mg, Al)2Ca,and CaMgSn phases. The as-extruded Mg–1Sn–1Ca–0.5Mn–1.5Al alloys exhibit a bimodal grain structure composed ofdynamic recrystallized (DRXed) fine grains and coarse unDRXed grains. Compared with Al free alloy, a lot of nano-scaleplanar Al2Caand rectangle shape Al8Mn5precipitated in the as-extruded alloy with 1.5 wt% Al. Meanwhile, the addition ofAl significantly strengthened alloys’ fiber texture with < 10–10 >//ED.
최적 금형연마 가공을 위한 센서 정보 통합 전문가 시스템 개발
안중환,김화영,申云峰,정해도,조규갑 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.1
This paper presents a polishing expert system integrated with sensor information which can modify the polishing sequence and conditions initially determined by the system depending on the on-site polishing status. A practical system using AE sensor to detect the on-line polishing status is developed for the rotational polishing and the smoothly curved sur-face. Database and knowledge base for polishing processes are established by using the results of experiments and also expert's experience. Evaluations are performed for a die of headlight lamp by using both the sensor integrated expert sys-tem and the expert system without sensor. The test results show that the sensor integrated expert system provides more optimal polishing conditions since the proposed system takes advantage of the on-line sensor information.
Feng-xia Lu,Lijuan Yuan,Zhiqiang Zhao,Chun-lei Wang,He-yun Bao 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.9
On the basis of the computational fluid dynamics (CFD) method, this study calculates the surface convective heat transfer coefficients of the sun gear, planetary gear, ring gear, and bearing before and after the opening of the planetary gear of a fan-driven gearbox. A numerical fitting method is used to establish the calculation model of the convective heat transfer coefficients of the sun gear, planetary gear, ring gear, and bearing under the open-hole oilreturn condition. The convective heat transfer coefficients of each element are compared before and after the hole is bored, and the design method for the gearbox parameters with the objective of heat transfer performance is proposed. Result shows that the convective heat transfer coefficients of each element are increased after oil is returned from the hole of the planetary gear, and the change rate of the convective heat transfer coefficient of the raceway in the planetary gear bearing is the highest. When the aperture of the planetary gear is 7 mm and the number of holes is four, the heat transfer performance of the gearbox is the best. The maximum error between the convection heat transfer coefficient fitting formula value and the CFD simulation calculation result is 1.0558 %.
Yun Que,Xue-feng Gui,Fu-Quan Chen 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.6
A cantilever retaining wall with a long relief shelf (CRW-LRS) is a particular type of retaining wall, but no studies have yet reported on rotation about the top of this type of retaining wall. This work studied failure mechanisms in semi-infinite non-cohesive soils in rotation about the top using the finite element elastoplastic analysis method (FEEA). By considering the influence of both the relief shelf and rotational stress from the soil, a formula for calculating the active earth pressure (Ea) was developed using the horizontal differential layer limit analysis method. Four different parameters were studied, i.e., unloading plate’s geometric conditions, heel length and the internal friction angle of the backfill, in terms of their influence on the Eadistribution, resultant force etc. The lowest Ea was found when the relief shelf’ relative position m = 0.4.
Feng, Zhi-Qiang,Yang, Xiao-Li,Ye, Yuan-Feng,Hao, Lin-Yun Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.4
The design, synthesis, and structural characterization of two new palladium complexes based on Schiff base ligands is reported; $[Pd(L1)_2]$ (1) and $[Pd(L2)_2]$ (2), [HL1 = 2-((E)-(2,6-diethylphenylimino)methyl)-4,6-dibromophenol, L2 = (E)-N-benzylidene-2,6-diethylbenzenamine], which are obtained by functionalizing Schiff base ligands with or without electron-withdrawing groups. Both compounds are mononuclear structures. Comparisons are made to the compounds 1 and 2 to analyze and understand the effect of electron-withdrawing groups. Antibacterial activity studies indicate the electron-withdrawing groups on Schiff base ligands enhance antibacterial activity. Catalytic activity, however, is reduced due to the enhanced steric-hindrance of the electron-withdrawing groups. Electronic absorption and emission properties of HL1, L2, 1 and 2 are also reported.
SSR and SCAR mapping of a multiple-allele male-sterile gene in Chinese cabbage (Brassica rapa L.)
Feng, Hui,Wei, Peng,Piao, Zhong-Yun,Liu, Zhi-Yong,Li, Cheng-Yu,Wang, Yu-Gang,Ji, Rui-Qin,Ji, Shu-Juan,Zou, Ting,Choi, Su-Ryun,Lim, Yong-Pyo Springer-Verlag 2009 TAG. Theoretical and applied genetics. Theoretisch Vol.119 No.2
Circular RNAs Regulate Cancer Onset and Progression via Wnt/β-Catenin Signaling Pathway
Yun-Feng Li,Jian Zhang,Lei Yu 연세대학교의과대학 2019 Yonsei medical journal Vol.60 No.12
Cancer remains to be a major challenge for public health providers, and is the second leading cause of death worldwide. Therefore,it is imperative to explore the mechanisms underlying cancer initiation and development, and design novel diagnostics andtherapeutics. Circular RNAs (circRNAs), which exhibit a covalently closed loop structure, are involved in a variety of diseases, includingcancer. The aberrant expression of circRNAs contributes to the initiation and development of various cancers by disruptingthe interplay of specific signaling pathways, including the Wnt/β-catenin pathway, which controls a plethora of cellular processesthat drive cancer development. The interactions between circRNAs (specifically expressed in different cancer tissues) andWnt/β-catenin signaling pathway presents potential diagnostic biomarkers and novel therapeutic targets. In this review, we havesummarized research discoveries on the functions of Wnt/β-catenin pathway-related circRNAs in the modulation of oncogenesisand progression of different types of cancer. We anticipate that our findings will contribute to the improvement or developmentof circRNAs-based strategies for cancer treatment.