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Seo, Hyunuk,Lim, Jaewon,Choe, Gyu-Ha,Choi, Jang-Young,Jeong, Jae-Hoon IEEE 2018 IEEE transactions on magnetics Vol.54 No.11
<P>This paper presents the analyses and experimental results of a single-sided linear induction motor (SLIM) thrust and normal force for the propulsion of semi-high-speed magnetic levitation (maglev) trains. These trains are composed of a levitation system that uses electromagnetic suspension and a propulsion system that uses SLIMs. The propulsion system of maglev trains using SLIMs has better low noise and dynamic characteristics compared with those using rotators. However, it has nonlinear characteristics due to the effect of slip that occur in the secondary eddy-current induction process; the normal force generated by the SLIM can negatively affect the levitation control. Therefore, a new slip-control algorithm is proposed for the safe operation of maglev trains, reflecting the normal force of the motor in propulsion control. First, the SLIM thrust and normal force are analyzed through the finite-element method (FEM) for a precise analysis of the slips. Furthermore, a slip range with a low normal force was derived based on the FEM analysis results, and these results are reflected in the propulsion control algorithm. Finally, the new algorithm was validated by an application to a full-sized testing apparatus.</P>
Highly Selective Carbon Dioxide Sorption in an Organic Molecular Porous Material
Kim, Hyunuk,Kim, Yonghwi,Yoon, Minyoung,Lim, Soyoung,Park, Se Min,Seo, Gon,Kim, Kimoon American Chemical Society 2010 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.132 No.35
<P>The organic molecular porous material <B>1</B> obtained by recrystallization of cucurbit[6]uril (CB[6]) from HCl shows a high CO<SUB>2</SUB> sorption capacity at 298 K, 1 bar. Most interestingly, <B>1</B> showed the highest selectivity of CO<SUB>2</SUB> over CO among the known porous materials so far. The remarkable selectivity of CO<SUB>2</SUB> may be attributed to the exceptionally high enthalpy of adsorption (33.0 kJ/mol). X-ray crystal structure analysis of CO<SUB>2</SUB> adsorbed <B>1</B> revealed three independent CO<SUB>2</SUB> sorption sites: two in the 1D channels (<B>A</B> and <B>B</B>) and one in the molecular cavities (<B>C</B>). The CO<SUB>2</SUB> molecules adsorbed at sorption site <B>A</B> near the wall of the 1D channels interact with <B>1</B> through hydrogen bonding and at the same time interact with those at site <B>B</B> mainly through quadrupole−quadrupole interaction in a T-shaped arrangement. Interestingly, two CO<SUB>2</SUB> molecules are included in the CB[6] cavity (site <B>C</B>), interacting not only with the carbonyl groups of CB[6] but also with each other in a slipped-parallel geometry. The exceptionally selective CO<SUB>2</SUB> sorption properties of <B>1</B> may find useful applications in the pressure swing adsorption (PSA) process for CO<SUB>2</SUB> separation not only in the steel industry but also in other industries such as natural gas mining.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2010/jacsat.2010.132.issue-35/ja105211w/production/images/medium/ja-2010-05211w_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja105211w'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja105211w'>ACS Electronic Supporting Info</A></P>