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주종대 ( Ju Jung-dae ),유용호 ( Yu Yong-ho ),김상돈 ( Kim Sang-done ) 대한화장품학회 1988 대한화장품학회지 Vol.14 No.1
Axial dispersion and dispersed phase holdup characteristics of a reciprocating plate extraction column in which six different plate arrangement have been investigated. The axial dispersion coefficient were correlated in terms of A<sup>2</sup> f which has the same dimension of axial dispersion cofficient. The minimum value of A<sub>2</sub> f increased with increase in free opening area fraction of plate. Dispersed phase holdup increased with the continuous phase velocity but it was relatively insensitive to changes in the dispersed phase velocity. Dispersed phase hold up decreased with an increase in free opening area fraction of plate.
SRF Test Facility for the Superconducting LINAC “RAON” - RRR Property and E-beam Welding
정유철,현명국,주종대,정미정 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.3
Equipment, such as a vacuum furnace, high pressure rinse (HPR), eddy current test (ECT) andbuffered chemical polishing (BCP), are installed in the superconducting radio frequency (SRF) testfacility. Three different sizes of cryostats (diameters of 600 mm for a quarter wave resonator (QWR),900 mm for a half wave resonator (HWR), and 1200 mm for single spoke resonator 1&2 (SSR 1&2))for vertical RF tests are installed for testing cavities. We confirmed that as-received niobium sheets(ASTM B393, RRR300) good electrical properties because they showed average residual resistanceratio (RRR) values higher than 300. However, serious RRR degradation occurred after joining twopieces of Nb by e-beam welding because the average RRR values of the samples were ∼179, whichwas only ∼60% of as-received RRR value. From various e-beam welding experiments in whichthe welding current and a speed at a fixed welding voltage were changed, we confirmed that goodwelding results were obtained at a 53 mA welding current and a 20-mm/s welding speed at a fixedwelding voltage of 150 kV.