http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Response of plasma rotation to resonant magnetic perturbations in J-TEXT tokamak
Yan, W,Chen, Z Y,Huang, D W,Hu, Q M,Shi, Y J,Ding, Y H,Cheng, Z F,Yang, Z J,Pan, X M,Lee, S G,Tong, R H,Wei, Y N,Dong, Y B IOP 2018 Plasma physics and controlled fusion Vol.60 No.3
<P>The response of plasma toroidal rotation to the external resonant magnetic perturbations (RMP) has been investigated in Joint Texas Experimental Tokamak (J-TEXT) ohmic heating plasmas. For the J-TEXT’s plasmas without the application of RMP, the core toroidal rotation is in the counter-current direction while the edge rotation is near zero or slightly in the co-current direction. Both static RMP experiments and rotating RMP experiments have been applied to investigate the plasma toroidal rotation. The core toroidal rotation decreases to lower level with static RMP. At the same time, the edge rotation can spin to more than 20 km s<SUP>−1</SUP> in co-current direction. On the other hand, the core plasma rotation can be slowed down or be accelerated with the rotating RMP. When the rotating RMP frequency is higher than mode frequency, the plasma rotation can be accelerated to the rotating RMP frequency. The plasma confinement is improved with high frequency rotating RMP. The plasma rotation is decelerated to the rotating RMP frequency when the rotating RMP frequency is lower than the mode frequency. The plasma confinement also degrades with low frequency rotating RMP.</P>
Sun,W.R.,Lee,J.H.,Guo,S.R.,Yoo,Y.S.,Choe,S.J.,Park,N.K.,Hu,Z.Q. 창원대학교 공작기계기술연구센터 1999 연구업적집 Vol.1 No.1
The effects of phosphorus on the phase transformation and stress rupture properties of alloy 718 were investigated. The nucleation of δ- phase, which does not contain phosphorus, was suppressed by the enrichment of phosphorus at grain boundaries. A low level of phosphorus resulted in the formation of faults-containing film-like δ- phase along the grain boundaries, while a higher level of phosphorus favored the long lath-like δ- phase precipitation. Phosphorus greatly prolonged the stress rupture life of the alloy in the range of 0.0008-0.013 wt.% while it reduced the stress rupture life in the range of 0.013-0.049 wt.% The effect of phosphorus in the stress rupture properties was closely related to its interaction with oxygen. Phosphorus atoms, in the range of 0.0008-0.013 wt.%, enhanced the resistance to oxygen intrusion along the grain boundaries, protected the grain boundaries from decohesion by oxygen atoms and oxidation, and subsequently prolonged the rupture life of the alloy. The protection effect of p is clearly demonstrated by the phenomenon that the crack initiation site was shifted from the surface to the center in the stress-ruptured samples with increasing addition of P. Over 0.013 wt.%, the protection effect of phosphorus is excessive and phosphorus began to display its inherent effect of damaging the grain boundary strength ; the stress rupture life of the alloy was reduced accordingly. Maximum stress rupture life was thus obtained at ∼0.013 wt.% P ⓒ 1998 Elsevier Science S.A. All rights reserved.
Liu, J.B.,Yan, H.L.,Cao, S.C.,Hu, Y.D.,Zhang, H.F. Asian Australasian Association of Animal Productio 2020 Animal Bioscience Vol.33 No.2
Objective: The study was conducted to evaluate the effects of the absorbent (a mixture of activated carbon and hydrated sodium calcium aluminosilicate) on growth performance, blood profiles and hepatic genes expression in broilers fed diets naturally contaminated with aflatoxin. Methods: A total of 1,200 one-day-old male chicks were randomly assigned to 6 treatments with 10 replicate cages per treatment. The dietary treatments were as follows: i) control (basal diets); ii) 50% contaminated corn; iii) 100% contaminated corn; iv) control+1% adsorbent; v) 50% contaminated corn+1% absorbent; vi) 100% contaminated corn+1% absorbent. Results: During d 1 to 21, feeding contaminated diets reduced (p<0.05) body weight (BW), average daily gain (ADG), and average daily feed intake (ADFI), but increased (p<0.05) feed-to-gain ratio (F/G). The absorbent supplementation increased (p<0.05) BW, ADG, and ADFI. There were interactions (p<0.05) in BW, ADG, and ADFI between contaminated corn and absorbent. Overall, birds fed 100% contaminated diets had lower (p<0.05) final BW and ADG, but higher (p<0.05) F/G compared to those fed control diets. The absorbent addition increased (p<0.05) serum albumin concentration on d 14 and 28 and total protein (TP) level on d 28, decreased (p<0.05) alanine transaminase activity on d 14 and activities of aspartate aminotransferase and alkaline phosphatase on d 28. Feeding contaminated diets reduced (p<0.05) hepatic TP content on d 28 and 42. The contaminated diets upregulated (p<0.05) expression of interleukin-6, catalase (CAT), and superoxide dismutase (SOD), but downregulated (p<0.05) glutathione S-transferase (GST) expression in liver. The absorbent supplementation increased (p<0.05) interleukin-1β, CAT, SOD, cytochrome P450 1A1 and GST expression in liver. There were interactions (p<0.05) in the expression of hepatic CAT, SOD, and GST between contaminated corn and absorbent. Conclusion: The results suggest that the naturally aflatoxin-contaminated corn depressed growth performance, while the adsorbent could partially attenuate the adverse effects of aflatoxin on growth performance, blood profiles and hepatic genes expression in broilers.
The Study on the Jet Nozzle Specified for Solar PV Power Enhancement
S.D. Jeong(정성대),Hu Qing Ping(호청평),K.Kim(김근),Y.H. Kim(김이현),Y.W. Sim(심영우),S.Phil. Yu(유상필) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Recently, solar power plants widely and quickly rise and expand. Because of the cost of solar cell, the crystalline silicon solar cell is the most widely used type. However, the conversion efficiency of solar cell is still very low. Furthermore, the conversion efficiency of solar cell will be decreased while the temperature of solar cell is going up. Especially, the conversion efficiency of solar cell will be decreased 20%-25% in summer. And the pollutant like as dust, pollen, snow etc. inevitably cover on the surface of solar panel in solar power plant which block the part of incident light absorbed by solar panel. In this article, a nozzle device called HJS(Hydraulic Jet Scanner) was developed to improve conversion efficiency of solar cell by cooling and cleaning solar panel for solar power plants. Cooling performance and cleaning performance of HJS(Hydraulic Jet Scanner) were tested. The improved efficient rate under cooling, the improved efficient rate under cleaning and the improved efficient rate under cooling and cleaning by HJS(Hydraulic Jet Scanner), these three data were measured and recorded. In order to prove that HJS(Hydraulic Jet Scanner) have better performance for improving efficiency of solar cell, another nozzle device called Rotor Sprinkler was tested as a comparison other. The results of experiments prove HJS(Hydraulic Jet Scanner) has cooling and cleaning performance And HJS(Hydraulic Jet Scanner) can improve conversion efficiency of solar cell by cooling and cleaning solar panel.
Multi-pass laser welding of thick plate with filler wire by using a narrow gap joint configuration
Y. C. Yu,S. L. Yang,Y. Yin,C. M. Wang,X. Y. Hu,X. X. Meng,S. F. Yu 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.7
A 17 mm low-carbon steel plate is welded by a fiber laser with a narrow gap joint configuration and multi-pass technique. A highspeed camera is used to real-time monitor the welding process, and the effects of groove size and the side shielding gas on the weld quality are studied. Experimental results showed that a concave shape in the bottom of weld can be formed when use a general shielding gas nozzle with the 8.0 mm external diameter. Through a special design of the shielding gas nozzle with the 2.0 mm external diameter which can deep into the interior of groove, the pressure from shielding gas can balance the surface tension from the liquid in the top of groove,so the shielding effect can be dramatically improved and the concave shape in the bottom of weld can be eliminated. When the filler wire and laser beam can smoothly enter the groove, using a relatively small groove size not only reduce the consumption of filler wire but also reduce the deflection of filler wire in the gap that can improve the fusion of groove.