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- 저자 : P. H. Khoi (검색결과 2 건)
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Maskey, S.,Chae, H.,Lee, K.,Dan, N.P.,Khoi, T.T.,Park, K. Elsevier Scientific Pub. Co 2016 Journal of hazardous materials Vol.317 No.-
Morphology and elemental composition of individual fine ambient particles varied among types of PM events and between two different urban environments having different major transportation systems (gasoline/diesel vehicles versus motorcycles). Carbonaceous particles were the most dominant in PM events, whereas S-rich particles were the highest in non-events at urban Gwangju in Korea. The aged soot, semi-volatile organic (SVO), and non-volatile organic (NVO) particles were more abundant in the polluted-long range transport (LTP) event than those in the dust-LTP event and non-event. In the dust-LTP event, the aged mineral dust particles outnumbered the fresh ones, suggesting the mineral dust particles were aged during their long-range transport. At HoChiMinh (HCM) in Vietnam, the fraction of carbonaceous particles was much higher than Gwangju (66% versus 30%) possibly due to more abundant two-stroke motor vehicles at HCM. Of the carbonaceous particles, combustion soot (19%) was the highest, followed by NVO (18%), SVO (17%), and biological particles (11%) at HCM, whereas SVO (11%) and NVO (10%) particles were the highest, followed by combustion soot particles (8%) at Gwangju. The higher fraction of mineral dust particles was also observed at HCM, indicating the sampling site was influenced by dust from unpaved roads and construction sites.
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Transition from 2-D to 1-D Transport in Superconducting YBa2Cu3O7
V. D. Lam,L. V. Hong,P. H. Khoi,J.F. Hamet,F. Boyer,이영백,J.P. Maneval 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
The resistive response of c-axis textured YBa₂Cu₃O7 bridges (100 nm thick and 10 m wide) has been studied dynamically on the nanosecond scale over a wide span of temperatures and currents. From Tc down to 75 K, dissipation is dominated by the viscosity of vortices spontaneously generated in the earth's magnetic eld. For 70 K < T < 75 K, vortex ow coexists with phase-slip centers (PSCs) characteristic of one-dimensional (1-D) transport. Eventually, below about 70 K, vortex ow is inhibited while, independently, PSCs transform into normal hot spots. All these resistive modes are identified by using a different time-varying voltage consecutive to the application of a step function of the current to the bridge.
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