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Keisuke Nishimura,Takashi Ikeda,Yuji Harata 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.춘계 No.-
The behavior of dual centrifugal pendulum vibration absorbers (CPVAs) are investigated when they are attached to a rotor in order to suppress torsional vibrations of a horizontally rotating shaft. The frequency response curves are theoretically determined using van der Pol’s method in the two cases where CPVAs are attached at point-symmetrical positions and identical positions. In the former case, Hopf bifurcations occur and combination resonances appear at comparatively higher rotational seeds than a Hopf bifurcation point. In the latter case, two types of localization phenomena may occur depending on the stiffnesses of torsion springs installed at the supporting points of the CPVAs. These phenomena are confirmed by calculating time histories and their frequencies. It is concluded that the optimal positions of the two pendula may exist to suppress the torsional vibrations of the rotor.
Study of rocking motion of rigid body with slide contact
Keisuke Nozaki,Yoshiaki Terumichi,Kazuhiko Nishimura,Kiyoshi Sogabe 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.4
The purpose of this study is to formulate the motion of a rigid body with unilateral contact problems by applying techniques of multibody dynamics and to analyze the issue of rocking condition of rigid bodies with slide contact. In To investigate rocking motion with slide contact, we formulate for dynamics of a simple rigid body system with a unilateral contact model. Judgment for the occurrence of contact between a rigid body and a base is applied. The planar motion of a rigid body system having a simple shape and both with and without slide cases is assumed. Using constraint conditions for the contact as algebraic equations, the rocking motion of the rigid body, including slide and frictional force, is analyzed. The differential algebraic equation is solved by the augmented method with Lagrange multipliers, using generalized coordinates and independent variables that describe the contact points. The influence of the frequency and amplitude of disturbance given to the base is discussed.
Intramolecular [2+2] Photocycloaddition and Cycloreversion of Ferulic Acid Derivatives
Maeda, Hajime,Nishimura, Keisuke,Yokoyama, Akihiro,Sugimoto, Akira,Mizuno, Kazuhiko,Hosoda, Asao,Nomura, Eisaku,Taniguchi, Hisaji Korean Society of Photoscience 2015 Rapid communication in photoscience Vol.4 No.1
Intramolecular photocycloaddition of ferulic acid derivatives proceeded in high yields to give head-to-head intramolecular photodimers as three atropisomers. The photocycloaddition was sensitized by triplet sensitizers such as benzophenone, whereas photocycloreversion was promoted by 9,10-dicyanoanthracene (DCA) as an electron-transfer photocatalyst. On the other hand, intermolecular photocycloaddition afforded a head-to-tail photodimer.
Watanabe Shinichi,Iida Yuki,Hirasawa Jun,Naito Yuji,Mizutani Motoki,Uemura Akihiro,Nishimura Shogo,Suzuki Keisuke,Morita Yasunari 대한재활의학회 2023 Annals of Rehabilitation Medicine Vol.47 No.3
Objective: To investigate the effect on early mobilization in patients undergoing extra-corporeal membrane oxygenation (ECMO) and acute blood purification therapy in the intensive care unit (ICU).Methods: We conducted this multicenter retrospective cohort study by collecting data from six ICUs in Japan. Consecutive patients who were admitted to the ICU, aged ≥18 years, and received mechanical ventilation for >48 hours were eligible. The analyzed were divided into two groups: ECMO/blood purification or control group. Clinical outcomes; time to first mobilization, number of total ICU rehabilitations, mean and highest ICU mobility scale (IMS); and daily barrier changes were also investigated.Results: A total of 204 patients were included in the analysis, 43 in the ECMO/blood purification group and 161 in the control group. In comparison of clinical outcome, the ECMO/blood purification group had a significantly longer time to first mobilization: ECMO/blood purification group 6 vs. control group 4 (p=0.003), higher number of total ICU rehabilitations: 6 vs. 5 (p=0.042), lower mean: 0 vs. 1 (p=0.043) and highest IMS: 2 vs. 3 (p=0.039) during ICU stay. Circulatory factor were most frequently described as barriers to early mobilization on days 1 (51%), 2 (47%), and 3 (26%). On days 4 to 7, the most frequently described barrier was consciousness factors (21%, 16%, 19%, and 21%, respectively)Conclusion: The results of this study comparing the ECMO/blood purification group and the untreated group in the ICU showed that the ECMO/blood purification group had significantly longer days to mobilization and significantly lower mean and highest IMS.