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King, J D,Strait, E J,Boivin, R L,Taussig, D,Watkins, M G,Hanson, J M,Logan, N C,Paz-Soldan, C,Pace, D C,Shiraki, D,Lanctot, M J,La Haye, R J,Lao, L L,Battaglia, D J,Sontag, A C,Haskey, S R,Bak, J G American Institute of Physics 2014 Review of scientific instruments Vol.85 No.8
<P>The DIII-D tokamak magnetic diagnostic system [E. J. Strait, Rev. Sci. Instrum. 77, 023502 (2006)] has been upgraded to significantly expand the measurement of the plasma response to intrinsic and applied non-axisymmetric '3D' fields. The placement and design of 101 additional sensors allow resolution of toroidal mode numbers 1 n 3, and poloidal wavelengths smaller than MARS-F, IPEC, and VMEC magnetohydrodynamic model predictions. Small 3D perturbations, relative to the equilibrium field (10(-5) < δB/B0 < 10(-4)), require sub-millimeter fabrication and installation tolerances. This high precision is achieved using electrical discharge machined components, and alignment techniques employing rotary laser levels and a coordinate measurement machine. A 16-bit data acquisition system is used in conjunction with analog signal-processing to recover non-axisymmetric perturbations. Co-located radial and poloidal field measurements allow up to 14.2 cm spatial resolution of poloidal structures (plasma poloidal circumference is ~500 cm). The function of the new system is verified by comparing the rotating tearing mode structure, measured by 14 BP fluctuation sensors, with that measured by the upgraded B(R) saddle loop sensors after the mode locks to the vessel wall. The result is a nearly identical 2/1 helical eigenstructure in both cases.</P>
( King Kwong Wong ) 서울대학교 규장각한국학연구원 2021 Seoul journal of Korean studies Vol.34 No.1
During the thirteenth and fourteenth centuries, the Mongols incorporated Koryŏ through a myriad of interstate relations. Either approaching from the Tributary-Investiture practice or from the thesis of Koryŏ as a part of the Mongol empire, scholars have previously focused on only one of the many aspects of Koryŏ-Yuan relations to provide a clear picture. By examining the institution of the Branch Secretariat for the Eastern Campaign and Koryŏ graduates of the Yuan civil service examination and their concepts of sovereignty, this paper suggests a new direction to consider Koryŏ-Yuan relations, in which sovereignty and allegiance were not so clear-cut. The Mongols originally established the Branch Secretariat in Koryŏ to facilitate their invasions of Japan. But the Branch Secretariat continued to evolve and became a political institution that symbolized the Mongols’ sovereignty over Koryŏ and conferred on Koryŏ literati political and legal statuses to partake in the Yuan civil service examination and to attain offices in the empire after graduation. This, by no means, suggests that these Koryŏ literati shifted their allegiance. Rather, one example, Yi Kok (1298-1351), defended Koryŏ’s autonomy by appealing to the Mongols’ Confucian rhetoric and emphasizing the difference between Koryŏ and Yuan. The Mongols’ use of a Confucian legitimation strategy―the concept of All-under-Heaven―ironically became a means for Koryo literati to subvert certain elements of the Mongols’ sovereignty. At the same time, their appeals also acknowledged the Mongols’ right to rule All-under-Heaven. This paper thus reveals the ambiguity of Koryŏ-Yuan relations and concepts of sovereignty.
King, Z.,Pal, B.,Schwartz, A. J.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Atmacan, H.,Aushev, T.,Ayad, R.,Bakich, A. M.,Behera, P.,Bhardwaj, V.,Bhuyan, B.,Biswal, J.,Bobrov, A.,Bozek, A.,Browder American Physical Society 2016 Physical Review D Vol.93 No.11
<P>We have searched for the decay B-0 -> phi gamma sing the full Belle data set of 772 x 10(6) B (B) over bar pairs collected at the gamma(4S) resonance with the Belle detector at the KEKB e(+)e(-) collider. No signal is observed, and we set an upper limit on the branching fraction of B(B-0 -> phi gamma) < 1.0 x 10(-7) at the 90% confidence level. This is the most stringent limit on this decay mode to date.</P>