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Nonlinear Rheology for a Grease
Karis, Thomas E.,Kono, Raymond-N.,Kim, Chul A.,Jhon, Myung S.,Choi, Hyoung Jin 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.4
Large amplitude oscillatory experiments were performed using a cone-and-plate geometry with two different greases. Odd harmonics of the resultant stress waveforms are used for obtaining the material parameters. The procedure for calculation the crossover shear rate. the first and second region viscosity, and an apparent yield stress form harmonic am;litude data are each shown. This technique observes a time-dependent structural transition between the unsteady initial state and the secondary state. We found that the crossover time decreases exponentially with the imposed shear rate. Furthermore, the grease with higher filler concentration was found to yield higher yield stress.
( M. Tamaki ),( T. Ishibashi ),( T. Yamazaki ),( S. Konda ),( K. Kono ),( S. Okada ),( T. Tomita ) 대한슬관절학회 2024 대한슬관절학회지 Vol.36 No.-
Introduction Patient satisfaction is an important outcome of total knee arthroplasty (TKA). However, we cannot predict how and why patients are satisfied or dissatisfied with TKA. The hypothesis of this study was that patient-reported outcomes (PROs) correlate with in vivo kinematics after TKA. Materials and methods One hundred knees were analyzed after TKA. The in vivo kinematics of deep knee bending motion were estimated from single-plane fluoroscopy using a two-to-three-dimensional registration technique. Active knee flexion, femoral rotation and rollback were evaluated. The PROs were obtained after surgery using the 2011 Knee Society Scoring System (KSS), and their relationship with in vivo kinematics was determined. Results The average minimum and maximum flexion were -2.4 ± 7.3° and 113.2 ± 13.6°, respectively. The average femoral rotation was 7.4 ± 3.4°, and the average medial and lateral rollback were 2.4 ± 4.8 mm and 7.2 ± 5.6 mm, respectively. The multiple regression analysis revealed that the maximum flexion angle significantly contributed to symptoms and satisfaction. In addition, lateral rollback was also a significant factor affecting patient satisfaction. Lateral rollback and lateral Anterior-Posterior (AP) position at maximum flexion were correlated with the maximum flexion angle, whereas femoral rotation did not correlate with flexion angles. Conclusions Maximum flexion and lateral rollback are important for better patient satisfaction after TKA. To obtain the maximum flexion angle, it was necessary to perform the normal kinematic pattern with a large amount of lateral rollback.
3D-TCO-less-dye-sensitized solar cells consisting of hybrid and tandem structures
Y. Kashiwa,Y. Ogomi,J. Usakawa,M. Kono,Y. Yamaguchi,S. Hayase 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
Efficiency of dye sensitized solar cells (DSC) [1] has reached 11%. In order to increase the efficiency, we propose 3D DSCs (Figures 1) consisting of dye-double layer structures and hybrid Ti electrodes to cover wide ranges of wavelengths and collect electrons effectively.