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Jiayue Wang,Yuwen Zhu,Hui Li,Sheng Liu,Shengnan Shen,Lei Wang,Shifeng Wen 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.4
Laser-based powder bed fusion (L-PBF) is an additive manufacturing (AM) technology that uses a high-energy–density laser to scan through a powder bed and completely melts the metal powder. The environment inside the printer chamber, including the flow field of the shielding gas and the spatter particles induced by laser–powder interactions, is essential for product quality. For the first time, this work built a full-size model of printer chamber, and numerically investigated the interaction between the shielding argon flow and the laser induced spatter particles with considering laser temperature. A full-size geometric model of a commercial L-PBF printer with a Gaussian heat source was constructed, as well as a movable particle-release source model for particle injection. The distribution of the argon flow field, the temperature field, and the trajectory and deposition of spatter particles, particularly above the workbench during the L-PBF process were quantitatively analyzed. The results show that the gas flow within 30 mm above the workbench is uniform, and in the upper region of the printer chamber, the flow field is disorderly. The laser can only induce high temperature and upward gas flow in a small region close to the workbench (the height less than 1.6 mm), and the laser induced velocity disturbance in rest regions of the L-PBF printer is negligible. Particles injected towards the outlet (ID4) are mostly blown into the outlet, and in the other four injection directions, more than 90% of spatter particles are deposited inside the printer chamber, especially more than 50% deposited on the workbench. Increasing the laser power (from 100 to 200 W) has little effect on particle deposition on the workbench. Results will be helpful for improving the L-PBF product quality.
Characterization and fine mapping of osh15(t), a novel dwarf mutant gene in rice (Oryza sativa L.)
Jiayu Wang,Shuxiu Fan,Xiaoyun Yao,Jin Liu,Xiaoyan Dong,Ting Mao 한국유전학회 2016 Genes & Genomics Vol.38 No.9
Plant height is one of the most important agronomic traits of plant architecture, and also affects grain yield in rice. In this study, we obtained a novel dwarf rice mutant of japonica variety Shennong9816, designated Shennong9816d. Compared with wild-type, the Shennong9816d plant height was significantly reduced, and the tiller number significantly increased. Additionally, the mutant yield component, and the number of large and small vascular bundles were significantly decreased compared with wildtype. Genetic analysis indicated that the Shennong9816d dwarf phenotype was controlled by a recessive nuclear gene, while the plant was shown to be sensitive to gibberellic acid. Using a large F2 population derived from a cross between Shennong9816d and the indica rice variety Habataki, the osh15(t) gene was fine mapped between RM20891 and RM20898, within a physical distance of 73.78 kb. Sequencing analysis showed that Shennong9816d carries a 1 bp mutation and a 30 bp insertion in the OSH15 region. These results suggest that osh15(t) is a novel allelic mutant originally derived from japonica variety Shennong9816, which may be useful for introducing the semi-dwarf phenotype to improve plant architecture in rice breeding practice.
Self-adjusted adsorption strategy for an aircraft skin inspection robot
Jiayue Gu,Congqing Wang,Xuewei Wu 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.6
A self-adjusted adsorption strategy is developed for an aircraft skin inspection robot with double frames to improve adsorption safety and movement stability. The principal aim is to determine the optimal value of adsorption force when the robot slips or overturns on the fuselage. A pneumatic system that consists of suction cup and cylinder control is designed. Static force analysis shows that the adsorption force of the aircraft skin inspection robot is related to the curvature of the fuselage. The relationship between the minimum value of adsorption force and offset angle of the robot barycenter is established with the least-squares support vector regression algorithm. Pulsewidth modulation is then applied to control the pressure difference in the suction cup. Experimental results prove the feasibility of suction cup control with the self-adjusted adsorption strategy.
Xuejiang Wang,Jie Chen,Xiangbo Yan,Xin Wang,Jing Zhang,Jiayu Huang,Jian-FuZhao 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
Citric acid chemical extraction technology in combination with ultrasonication was used to removeheavy metals from industrial and municipal mixed sludge. The removal efficiencies of Zn, Ni, Cr and Cureached 53.5%, 40.2%, 35.4% and 13.1%, respectively, at citric acid concentration of 0.2 M assisted byultrasound for 20 min. The extracted Zn, Ni and Cr mainly came from acid-soluble, reducible andoxidizable fractions, and Cu mainly came from oxidizable and reducible fractions. The presence of Fe3+,Al3+ and Ca2+ improved the extraction efficiency of Cu from the sludge significantly. The extracted sludgecould be used for soil amendment.
Hu Hao,Wang Jiayue,Chen Ai,Liu Yang 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.1
Autonomous radiation source detection has long been studied for radiation emergencies. Compared to conventional data-driven or path planning methods, deep reinforcement learning shows a strong capacity in source detection while still lacking the generalized ability to the geometry in unknown environments. In this work, the detection task is decomposed into two subtasks: exploration and localization. A hierarchical control policy (HC) is proposed to perform the subtasks at different stages. The low-level controller learns how to execute the individual subtasks by deep reinforcement learning, and the highlevel controller determines which subtasks should be executed at the current stage. In experimental tests under different geometrical conditions, HC achieves the best performance among the autonomous decision policies. The robustness and generalized ability of the hierarchy have been demonstrated
Setosphapyrone C and D accelerate macrophages cholesterol effl ux by promoting LXRa/ABCA1 pathway
Ting Li,Jiayu Yin,Yubin Ji,Ping Lin,Yanjie Li,Zixun Yang,Shumei Hu,Jin Wang,Baihui Zhang,Saloni Koshti,Junfeng Wang,Chenfeng Ji,Shoudong Guo 대한약학회 2020 Archives of Pharmacal Research Vol.43 No.8
LXRα agonists have attracted signifi cant attentiondue to their potential biological activities on promotingcholesterol effl ux. This study was designed to investigatewhether setosphapyrone C and D have potential lipid-loweringcapacity and the underlying mechanisms in vitro. Ourdata showed that setosphapyrone C and D had weak cytotoxicitycompared to the liver X receptor α (LXRα) agonistT0901317. In RAW 264.7 macrophages, setosphapyroneC and D signifi cantly enhanced [ 3 H]-cholesterol effl ux by~ 21.3% and 32.4%, respectively; furthermore, setosphapyroneC and D enhanced the protein levels of ATP-bindingcassette transporter (ABC) A1 and LXRα by 58% and 69%,and 60% and 70% (8 μM), respectively; however, they had noeff ect on the protein levels of ABCG1 and scavenger receptorB type 1; additionally, they had minor eff ect on the mRNAexpression of lipogenic genes. Of note, setosphapyrone C and D signifi cantly enhanced LXRα/ABCA1pathway inmice primary macrophages. In BRL cells, setosphapyroneC and D signifi cantly improved the protein levels of ABCA1and ABCG1; setosphapyrone D signifi cantly enhanced theprotein expression of low-density lipoprotein. Collectively,setosphapyrone C and D with weak cytotoxicity exhibitedeff ective lipid-lowering eff ect via enhancing LXRα/ABCpathways. Setosphapyrones possess potential applicationfor the treatment of hyperlipidemic diseases.