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Nonlinear finite element analysis of top- and seat-angle with double web-angle connections
Kishi, N.,Ahmed, A.,Yabuki, N.,Chen, W.F. Techno-Press 2001 Structural Engineering and Mechanics, An Int'l Jou Vol.12 No.2
Four finite element (FE) models are examined to find the one that best estimates moment-rotation characteristics of top- and seat-angle with double web-angle connections. To efficiently simulate the real behavior of connections, finite element analyses are performed with following considerations: 1) all components of connection (beam, column, angles and bolts) are discretized by eight-node solid elements; 2) shapes of bolt shank, head, and nut are precisely taken into account in modeling; and 3) contact surface algorithm is applied as boundary condition. To improve accuracy in predicting moment-rotation behavior of a connection, bolt pretension is introduced before the corresponding connection moment being surcharged. The experimental results are used to investigate the applicability of FE method and to check the performance of three-parameter power model by making comparison among their moment-rotation behaviors and by assessment of deformation and stress distribution patterns at the final stage of loading. This research exposes two important features: (1) the FE method has tremendous potential for connection modeling for both monotonic and cyclic loading; and (2) the power model is able to predict moment-rotation characteristics of semi-rigid connections with acceptable accuracy.
Recent Advances in Dry-bag CIP Equipment
Kishi Yoshikazu,Miyashita Yasuhide,Manabe Yasuo,Fujikawa Takao 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Intensive technological research on the Dry-bag CIP equipment was carried out to improve the dimensional accuracy and the productivity. The rubber mold design technology using FEM simulation during pressing was introduced, in order to achieve higher dimensional preciseness, and criteria for the selection of the In-line type or Off-line type, were established based on the powder flowability index proposed by Carr. Based on these research results, high productivity Off-line Dry-bag CIP equipment, which can realize good dimensional accuracy with high productivity, was developed even for non-granulated powders with poor packing density.
N.Kishi,K.Morita 한국물리학회 2003 Current Applied Physics Vol.3 No.1
The composition and atomic arrangement of the Si(111)-3p.3p-Sb surface have been studied by means of co-axial impactcollision ion scattering spectroscopy combined with low energy electron diraction, Auger electron spectroscopy and Rutherfordbackscattering spectrometry techniques. It is found that the Sb/Si(11) surface forms the3p.3pstructure at a coverage of 0.90ML, which is determined by RBS. The azimuthal angle scan is also found to show prominent focussing peaks at. 12. around the(112) planes at a polar angle of 13.$ . . . 6 . 0 . . . . 3p.3p-Sb surface forms thetrimer centered at the T4 site and the spacing of SbSb in the trimer is 2:8 . 0:05 .AA.. 2002 Elsevier Science B.V. All rights reserved.
NAOKI KISHI,SHINYA KATO,TAKESHI SAITO,JUNKI HAYASHI,DAIKI ITO,YASUHIKO HAYASHI,TETSUO SOGA,TAKASHI JIMBO 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.6
We report the exploration of PEDOT:PSS/SWCNTs as a material for the hole transport layer of polymer solar cells. The electrical conductivity of PEDOT:PSS/SWCNT film was enhanced as compared to that of PEDOT:PSS because of the carrier transport pass through SWCNTs. Moreover, we have fabricated polymer solar cells with the hole transport layer of PEDOT:PSS/SWCNTs and demonstrated the improvement of a fill factor and short circuit current density in the polymer solar cells with the hole transport layer of PEDOT:PSS/SWCNT as compared to the PEDOT:PSS.