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Zhang T.,Du W.Y.,Zhan C.Y.,Wang M.M.,Deng H.W.,Xie Z.M.,Li H. 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.8
The synergistic effect of ZrC nanoparticle pining and Re solution in W matrix on the thermal stability of tungsten was studied by investigating the evolution of the microstructure, hardness and tensile properties after annealing in a temperature range of 1000e1700 C. The results of metallography, electron backscatter diffraction pattern and Vickers micro-hardness indicate that the rolled W-1wt%Re-0.5 wt% ZrC alloy has a higher recrystallization temperature (1600 Ce1700 C) than that of the rolled pure W (1200 C), W-0.5 wt%ZrC (1300 C), W-0.5 wt%HfC (1400e1500 C) and WeK-3wt%Re alloy fabricated by the same technology. The molecular dynamics simulation results indicated that solution Re atoms in W matrix can slow down the self-diffusion of W atoms and form dragging effect to delay the growth of W grain, moreover, the diffusion coefficient decrease with increasing Re content. In addition, the ZrC nanoparticles can pin the grain boundaries and dislocations effectively, preventing the recrystallization. Therefore, synergistic effect of solid solution Re element and dispersed ZrC nanoparticles significantly increase recrystallization temperature
Effects of Acteoside on Maturation and Development of Porcine Oocytes In Vitro
K. J. Kim,J. H. Lee,X. X. Li,E. Y. Kim,Y. B. Park,K. S. Park,Y. N. Ha,M. Kim,K. W. Han,J. Y. Park,J. Yu,D. S. Lee,Min Kyu Kim 한국동물생명공학회(구 한국동물번식학회) 2011 발생공학 국제심포지엄 및 학술대회 Vol.2011 No.1
Acteoside (verbascoside) is a typical phenylethanoid glycoside, extracted from various plants. It has various biological functions such as anti-oxidant, anti-inflammation, and anti-hypertension. Specially, it was powerful anti-oxidants either by direct scavenging of reactive oxygen and nitrogen species, or by acting as chain-breaking peroxyl radical scavengers. We examined the role of acteoside in IVM medium on the morphological progress of meiosis, developmental competence, and ROS in porcine oocytes. And we investigated effect of acteoside on the oocytes condition represented by cytoplasmic maturation by homogeneous distribution and formation of cytoplasmic organelles and regulation of apoptosis-related genes. The selected COCs were cultured in TCM-199 with various concentration of acteoside: 0 (control), 10, 30, and 50 μM. After 22 h of maturation with hormones, the oocytes were washed twice in a fresh maturation medium before being cultured in hormone-free medium for additional 22 h. The oocytes maturation rates of supplemented with acteoside were no significantly different compared with control group (71.13, 75.96, 72.95 and 73.68%, respectively). Level of ROS was significantly decreased in acteoside treated group. Furthermore, the parthenogenetic blastocyst rate was significantly improved in 10 μM acteoside treated group compared with control group (40.03 vs. 22.95%). During IVM, 10 μM acteoside treated oocytes showed that the mitochondria and lipid droplet were smaller and homogeneous distribution in cytoplasm compare with non-treated control oocytes. And reverse transcription polymerase chain reaction (RT-PCR) witarthenogenetic blstocysts revealed that acteoside increased the anti-apoptoticgenes, otherwise reibued pro-apoptotic genes. In conclusion, our results represents that addition of acteoside to the IVM medium has a beneficial effect in physiology of porcine oocytes such as viability and activation, providing a improved method for porcine oocytes in vitro.
( Stacey C. Y. Li ),( Catherine W. C. Chan ),( Janet K. Y. Chan ) 한국폐기물자원순환학회 2022 ISSE 초록집 Vol.2022 No.-
Mobile phones have become one of the most indispensable items of our daily life. People normally have the practice of reselling their old phones or other electronic devices because of their high value. However, the USB cables normally come with these gadgets are always forgotten. As the USB cables are made of plastics and metals, it would be a waste of resources if they were sent to the landfill directly. There is a lack of data and studies regarding the amount of USB cable waste, and people’s handling and disposing habits of them in Hong Kong. This action-cum-research project, namely “Off-lines”, therefore aims to raise people’s awareness on e-waste beginning with a type of waste that everyone has, that is USB cable, and to fill in the research gap on people’s awareness and knowledge on this kind of e-waste. One hundred and fifty collection points were set up all over Hong Kong by this project and successfully collected over 7,700 unwanted cables from the public. This project also conducted a questionnaire survey from February 2022 to May 2022 and received 457 valid responses from the public. The results of the questionnaires show that nearly 70% of respondents do not know USB cables can be recycled. The three major reasons for not recycling USB cable are: 1) Not knowing any collection points (71%); 2) Lack of knowledge on USB cable recycling (67%); and 3) Inconvenient and insufficient collection points (67%). Upcycling workshops were also organised not only to provide a chance for the participants to have hands-on experience on making knots with USB cables, but also to inspire them to think out of the box and give any unwanted item a second life. Feedback from the public and also the business sector found the project very meaningful and successfully heightened the public awareness on e-waste issues. Collaboration with green groups and other partnering organisations should be extended to provide wider and immersive networks for collecting unwanted USB cables or other cables.
우영윤(Y. Y. Woo),이민(M. Li),강형석(H. S. Kang),황태우,문영훈,T. W. Woo 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
The flexible roll forming process makes it possible to produce profiles with a variable width by controlling the roll stands with CNC. But profile with variable cross-sections by flexible roll forming has a shape defects, so called buckling. Buckling occurs due to the geometrical deviations which cause longitudinal residual stress in the transitional zones of the profile between the initial metal strip and the roll-formed profile. Therefore in this study, the effect of forming parameters of metal blank on the longitudinal and shape error which are affected by several parameters have been performed to prevent buckling. The parameter investigated in this study is the forming angle. For the flexible roll forming experiments, symmetrical U-sections are formed from advanced high strength steel (AHSS) blank. Numerical simulations by finite element analysis have also been performed to analyze strain variations during roll forming. The tracing of incremental strains at the edge may provide insights to solve buckling problems. From the analysis results, the behavior of buckling in flexible roll forming process can be predicted with relation between geometry parameters and longitudinal and shape error.