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다결정 초전도체 ${SmBa_2}{Cu_3}{O_x}$의 자기 이력곡선
이준호,정미숙,이부영,김건철,김영철,정대영,Lee J. H,Jung M. S,Lee B. Y,Kim G. C,Kim Y. C,Jeong D. Y 한국초전도학회 2004 Progress in superconductivity Vol.6 No.1
The polycrystalline superconductor $SmBa_2$$Cu_3$$O_{x}$ is fabricated, and intergranular magnetic properties are investigated using the critical state model, from which some useful parameters such as the critical current density and the intergranular volume fraction are obtained. The curve fitting for M-H hysteresis loop shows that the intergranular critical current density of $SmBa_2$$Cu_3$$O_{x}$ / decreases in the form of ($1-T/T_{c}$ )$^{1.5}$ . The intergranular volume fraction is influenced by granular morphology. From SEM image, the grains of $SmBa_2$$Cu_3$$O_{x}$ are found to be randomly shaped. This mean:; that the intergranular volume fraction of $SmBa_2$$Cu_3$$O_{x}$ / should be smaller than those of superconductors, of which grains are plate-shaped such as Tl-based superconductor.
이준호(J. H. Lee),막슈다 쥬레바(M. Juraeval),송동주(D. J. Song) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.11
Subway has become the main transportation in the major cities. An air quality in subway is an important to the passengers. Unclean air leads health problems including respiratory, cardiovascular diseases, and asthmatics. The ventilation system of subway is main concern for this case. There are a lot of numerical and experimental studies held for subway station ventilation systems. This research investigates the tunnel ventilation and the environmental control system of the subway using Computational Fluid Dynamics by solving Reynold-averaged Navier-Stokes equations for train-wind unsteady flow. The ANSYS CFX 12.0 software is used to perform unsteady computations of the flow field at the subway tunnel.
이준호(J.H. Lee),막슈다 쥬레바(M. Juraeva),송동주(D.J. Song) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
Understanding train-wind is the best method to know how to optimize subway ventilation system. The capacity and efficiency of the subway ventilation system are known by pressure and velocity while train runs. Analysis of the internal flow in subway tunnel and around subway station are studied using numerical methods. Characteristics of internal flow and influence of subway ventilation system for the subway station with platform screen door and tunnel are analyzed by unsteady state analysis. Velocity and pressure of train wind transformation are compared at around subway ventilation system and the internal flow is investigated at the subway tunnel.