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Field-controllable injection of virtual magnetic domainwall in discrete magnetic nanodot chains
Xiao-Ping Ma,김선대,PIAO HONGGUANG,김동현 한국물리학회 2018 Current Applied Physics Vol.18 No.1
Periodic injection behaviors of virtual magnetic domain wall (VDW) have been systematically investigated in asymmetrically shaped nanodot chains by means of micromagnetic simulations. Systematic investigation on a controllable VDW injection has been carried out. We demonstrate that precise control of VDW injection is achievable by using different nanodot shapes as well as by changing alternating magnetic field (AC field) profiles. The VDW position can be tuned by adjusting AC field frequency and amplitude. Field-controllable periodic VDW injection phenomenon is found to be sustainable over wide ranges of phase diagram spanned by AC field frequency and amplitude.
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중국 단동 지역에서 국내 벼 품종의 출수 반응과 적응 출수생태 특성
양운호(Woonho Yang),Hongguang Ju,김정주(Jeong-Ju Kim),한아름(Areum Han),양정욱(Jung-Wook Yang),김은영(Eun Young Kim),강신구(Shingu Kang),이대우(Dae-Woo Lee),채미진(Mi-jin Chae),신명나(Moung Na Shin),Dongchun Jin,Jin Piao,Jichun 한국작물학회 2023 한국작물학회지 Vol.68 No.3
1. 벼 재배기간에 단동 지역의 평균기온은 북한의 신의주보다 약간 낮게, 수풍보다는 약간 높게 경과하였으며, 이들세 지역의 일장 변화는 거의 동일하였다. 2. 시험 연도와 이앙시기에서 공통적으로 단동 지역의 안전출수한계기와 현지 품종 중 가장 늦은 출수기까지 출수한 국내 품종은 조생종 8개(진부올, 백일미, 조운, 진옥, 조평, 진부, 산호미, 오대)였으며, 북한 품종은 5개(올벼2, 선봉9, 온포1, 길주1, 평도15)였다. 3. 국내 13품종과 북한 7품종의 기본영양생장성은 12~43 일, 감광성은 3~56일, 감온성은 15~33일 범위였는데, 국내 중생 및 중만생 3품종(선품, 신보, 소비)과 북한 평양21은 감광성이 33~56일로 컸고, 다른 3품종(아세미, 진미, 평도5)은 기본영양생장성이 40~43일로 큰 특징을 보였다. 4. 단동 시험포장에서 나타난 벼 품종의 출수기는 감광성과고도로 유의한 정의 상관을 나타내었으며, 감광성이 컸던 중생과 중만생 3품종을 제외하면 기본영양생장성과유의한 정의 상관관계가 인정되었다. 5. 단동 지역의 벼 재배기간에 적응하는 품종은 기본영양생장성 35일 이하와 감광성 25일 이하를 모두 충족하는 출수생태 특성을 보였다. We examined the heading responses of rice varieties over two years in Dandong, China to select the varieties that are adaptable to the bordering northwestern plains of North Korea. Dandong had slightly lower mean temperature than Sinuiju, North Korea but slightly higher than Supung, but it had almost the same day-length as the two regions in North Korea. In the two experimental years and two transplanting-date treatments, eight varieties (Jinbuol, Baegilmi, Joun, Jinok, Jopyeong, Jinbu, Sanhomi, and Odae) from South Korea and five varieties (Olbyeo2, Sonbong9, Onpo1, Gilju1, and Pyongdo5) from North Korea reached the heading stage not later than the latest heading dates of Dandong domestic varieties and the safe marginal heading dates of Dandong. We examined the basic vegetative phase (BVP), photoperiod-sensitivity (PS), and thermo-sensitivity (TS) of rice heading in a phytotron study to characterize the heading ecotypes of rice varieties adaptable to Dandong. For the rice varieties grown in Dandong experimental field, number of days to the heading stage was highly positively correlated with PS and, except middle and mid-late maturing three varieties, it was significantly positively correlated with BVP. Two-dimensional distribution plotting revealed that both 35 days or less BVP and 25 days or less PS were the characteristic heading ecotypes of the rice varieties adaptable to Dandong.
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Magnetic-field-tuned Insulator to Conductor Transition in Magnetorheological Suspension
Xiongbo Yang,Yuhuan Jiang,Yuehua Huang,Ruizhen Xu,Hongguang Piao,Gaomeng Jia,Xinyu Tan 한국자기학회 2014 Journal of Magnetics Vol.19 No.4
Magnetorheological suspensions (MRSs) are smart materials that have the potential to revolutionize several industrial sectors because of their special rheological behaviors. In this paper, MRS, based on carbonyl iron (CI) microparticles that were dispersed in silicone oil with oleic acid, were prepared. We showed that the electroconductibility of MRS was significantly influenced by the intensity of the external magnetic field that was applied. The resistance value can vary from infinite to below 300 Ω after applying an external magnetic field. The results indicated that this MRS had the property of magnetic-field-tuned insulator to conductor transition. This system has potential applications in controllable MRS electrical devices.
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