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조경석,봉수찬,최성환,양희수,김지헌,백지혜,박종엽,임은경,김록순,김수진,김연한,박영득,S.W. Clarke,J. M. Davila,N. Gopalswamy,V. M. Nakariakov,B. Li,R. F. Pinto 한국천문학회 2017 Journal of The Korean Astronomical Society Vol.50 No.5
The Korea Astronomy and Space Science Institute plans to develop a coronagraph in collaboration with National Aeronautics and Space Administration (NASA) and to install it on the International Space Station (ISS). The coronagraph is an externally occulted one-stage coronagraph with a field of view from 3 to 15 solar radii. The observation wavelength is approximately 400~nm, where strong Fraunhofer absorption lines from the photosphere experience thermal broadening and Doppler shift through scattering by coronal electrons. Photometric filter observations around this band enable the estimation of 2D electron temperature and electron velocity distribution in the corona. Together with a high time cadence ($<$12~min) of corona images used to determine the geometric and kinematic parameters of coronal mass ejections, the coronagraph will yield the spatial distribution of electron density by measuring the polarized brightness. For the purpose of technical demonstration, we intend to observe the total solar eclipse in August 2017 with the filter system and to perform a stratospheric balloon experiment in 2019 with the engineering model of the coronagraph. The coronagraph is planned to be installed on the ISS in 2021 for addressing a number of questions (e.g., coronal heating and solar wind acceleration) that are both fundamental and practically important in the physics of the solar corona and of the heliosphere.
TOWARD NEXT GENERATION SOLAR CORONAGRAPH: DEVELOPMENT OF COMPACT DIAGNOSTIC CORONAGRAPH ON ISS
Kyungsuk Cho,Suchan Bong,Seonghwan Choi,Heesu Yang,Jihun Kim,Jihye Baek,Jongyeob Park,Eun-Kyung Lim,Rok-Soon Kim,Sujin Kim,Yeon-Han, Kim,Young-Deuk Park,S.W. Clarke,J.M. Davila,N. Gopalswamy,V. M. Nak 한국천문학회 2017 天文學會報 Vol.42 No.2
Bahramy, M. ,S.,Clark, O. ,J.,Yang, B.-J.,Feng, J.,Bawden, L.,Riley, J. ,M.,Marković,, I.,Mazzola, F.,Sunko, V.,Biswas, D.,Cooil, S. ,P.,Jorge, M.,Wells, J. ,W.,Leandersson, M Nature Publishing Group, a division of Macmillan P 2018 NATURE MATERIALS Vol.17 No.1
Transition-metal dichalcogenides (TMDs) are renowned for their rich and varied bulk properties, while their single-layer variants have become one of the most prominent examples of two-dimensional materials beyond graphene. Their disparate ground states largely depend on transition metal d-electron-derived electronic states, on which the vast majority of attention has been concentrated to date. Here, we focus on the chalcogen-derived states. From density-functional theory calculations together with spin- and angle-resolved photoemission, we find that these generically host a co-existence of type-I and type-II three-dimensional bulk Dirac fermions as well as ladders of topological surface states and surface resonances. We demonstrate how these naturally arise within a single p-orbital manifold as a general consequence of a trigonal crystal field, and as such can be expected across a large number of compounds. Already, we demonstrate their existence in six separate TMDs, opening routes to tune, and ultimately exploit, their topological physics.
Characterization of carboxylesterase-mediated pirimicarb resistance in Myzus persicae
Kwon, D.H.,Choi, B.R.,Lee, S.W.,Clark, J.M.,Lee, S.H. Academic Press 2009 Pesticide biochemistry and physiology Vol.93 No.3
The biochemical and molecular mechanisms of pirimicarb resistance were investigated in a pirimicarb-resistant (Pc-R) strain of Myzus persicae. The Pc-R strain showed a 131-fold resistance to pirimicarb but no or slight cross-resistance to other organophosphate and carbamate insecticides. Interestingly, the strain showed a moderate level of cross-resistance to neonicotinoids. Sequence analysis of the acetylcholinesterase (AChE) gene revealed that the Ser431Phe mutation, previously known to be associated with AChE insensitivity, was saturated in the Pc-R strain, and the AChE insensitivity caused by the mutation is likely a major pirimicarb resistance mechanism. In addition, detoxifying enzyme assays suggested that enhanced carboxylesterase (CbE) activity is associated with pirimicarb resistance as a supporting mechanism. The higher CbE activity in the Pc-R strain was determined to be mainly due to a pI 4.9 esterase by native isoelectricfocusing. The resistance-associated CbE was further identified as the E4 type by native two-dimensional gel electrophoresis in conjunction with matrix-assisted laser desorption ionization-time of flight mass spectrometry. The gene copy number and transcription level of the E4 CbE were increased 4.0- and 10.5-fold in the Pc-R strain, respectively, suggesting that both gene duplication and transcriptional regulation of E4 CbE are associated with pirimicarb resistance.
Gu G. M.,Chae K. Y.,Cha S. M.,Kwag M. S.,Kim M. J.,Allen J.,O’Malley P. D.,Boeltzig A.,Clark A. M.,Frentz B.,Kolk B. V.,Blankstein D.,Bardayan D. W.,Wilkinson J.,Seymour G.,Howard K. B.,Renaud M.,Hall 한국물리학회 2024 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.85 No.3
The 24Mg(훼,p) 27Al reaction was measured using the solenoid spectrometer for nuclear astrophysics at the University of the Notre Dame to study the astrophysical 24Mg(훼,p) 27Al reaction rate. Alpha beams from the 10-MV FN tandem accelerator impinged on 24Mg solid targets which were made using the vacuum evaporation method on 12C foils. A total of 43 beam energies were used. Recoiling protons from the 24Mg(훼,p) 27Al reaction were detected using a double-sided position sensitive silicon detector array mounted on the solenoid. Energies, times of fight, and fight distances of particles were measured for particle identifcation. Protons associated with a wide range of excitation energies Ex = 12.42–14.44 MeV in 28Si were identifed.