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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
Xiao-Yong Zhou,Yan Shen,Er-Tao Hu,Jian-Bo Chen,Yuan Zhao,Ming-Yu Sheng,Jing Li,Yu-Xiang Zheng,Hai-Bin Zhao,Liang-Yao Chen,Wei Li,Xun-Ya Jiang,이영백,David W. Lynch 한국광학회 2013 Current Optics and Photonics Vol.17 No.1
Based on the dispersive feature of the dielectric function of noble metals and the wave vector conservation in physics, both the plasma effect and the complex refractive index, which are profoundly correlated to the complex dielectric function and permeability, have been studied and analyzed. The condition to induce a bulk or a surface plasma in the visible region will not be satisfied, and there will be one solution for the real and the imaginary parts of the refractive index, restricting it only to region I of the complex plane. The results given in this work will aid in understanding the properties of light transmission at the metal/dielectric interface as characterized by the law of refraction in nature.
ZhEng, D. W.,Huang, Y. P.,Tang, T. A.,Cui, Q.,Li, A. Z.,Zhou, S. X.,He, Z. J.,Chen, Z.,Zhang, X. J.,Kwor, R. 대한전자공학회 1993 ICVC : International Conference on VLSI and CAD Vol.3 No.1
A novel process for silicon on insulator(SOI) technology has been presented. Single crystal Si is grown by molecular beam epitaxy(MBF) on a porous silicon(PS) system consisting of two layers of PS with different microstructures. Subsequent lateral oxidation converts the structure to SOI wish excellent insulation property. Si islands with a width of 135㎛ and low doping concentration have been achieved.
( 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.
벼 배유세포에서 (胚乳細胞) 분리된 미크로좀 내로의 저장 (貯藏) 단백질 이동
김우택,Xingxiang Li,Thomas W . Okita (Woo Taek Kim) 한국식물학회 1994 Journal of Plant Biology Vol.37 No.3
Developing rice endosperm cells display two morphologically distinct rough endoplasmic reticulum (ER) membranes, the cisternae ER (C-ER) and the protein body ER (PB-ER), the latter delimiting the prolamine protein bodies. We (Li et al., 1993) have recently shown that the storage protein mRNAs are not randomly distributed on these ER types; the C-ER is enriched for glutelin mRNAs, whereas the PB-ER harbors predominantly prolamine transcripts. To address whether these ER types have different capacities to translate these mRNAs and translocate their proteins into the lumen, a microsomal fraction enriched in C-ER vesicles was prepared from developing rice seeds When present in an in vitro translation system, the microsomes were able to proteolytically remove the signal peptide and internalize both preproglutelin and preprolamine within the microsomal vesicles. Of the two species, preprolamine was more effectively translocated and processed. These results suggest that the C-ER has the capacity to recognize and bind both storage protein mRNAs during protein synthesis. Moreover, efficient translocation and processing of glutelin requires additional factors that are deficient or absent in the in vitro system.
Li, W.,Yoon, D.,Hwang, J.,Chang, W.,Kim, J. Elsevier Sequoia 2015 Journal of Power Sources Vol.293 No.-
A simple, one-pot route was developed for the synthesis of SnO<SUB>2</SUB>-reduced graphene oxide (RGO) composites. Simultaneous reduction of graphene oxide (GO) and heterogeneous nucleation and growth of SnO<SUB>2</SUB> on the surface of RGO under the supercritical methanol medium resulted in uniform deposition of well-dispersed SnO<SUB>2</SUB> nanoparticles on the RGO sheets. In comparison with the bare SnO<SUB>2</SUB> nanoparticles and bare RGO sheets, the as-synthesized SnO<SUB>2</SUB>-RGO composites exhibited enhanced Li-ion storage and high rate performance. The SnO<SUB>2</SUB>-RGO composite with a SnO<SUB>2</SUB> loading of 58 wt% delivered a reversible discharge capacity of 776 mAh g<SUP>-1</SUP> after 70 cycles at a current density of 0.1 A g<SUP>-1</SUP> and a rate performance of 147 mAh g<SUP>-1</SUP> at a high current density of 5 A g<SUP>-1</SUP>. In addition, after 1000 continuous cycles at 1 A g<SUP>-1</SUP>, the composite electrode exhibited a reversible discharge capacity as high as 531 mAh g<SUP>-1</SUP> with excellent capacity retention. The enhanced long-term cyclability and high-rate performance of the SnO<SUB>2</SUB>-RGO composite can be attributed to the effective confinement of SnO<SUB>2</SUB> nanoparticles on the RGO sheets, and thus, the interparticle agglomeration and volume change associated with alloying-dealloying of SnO<SUB>2</SUB> during cycling can be prevented and cell integrity can be maintained.