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Origin of Spherule Samples Recovered from Antarctic Ice Sheet-Terrestrial or Extraterrestrial?
Sekimoto, Shun,Kobayashi, Takayuki,Takamiya, Koichi,Ebihara, Mitsuru,Shibata, Seiichi Korean Nuclear Society 2016 Nuclear Engineering and Technology Vol.48 No.2
Thirty-eight spherules from the Antarctic ice sheet were analyzed using neutron activation analysis under two different conditions to investigate their origin. In almost all of these spherules, the contents of iron, cobalt, and manganese were determined to be 31% to 88%, 17 mg/kg to 810 mg/kg, and 0.017% to 7%, respectively. A detectable iridium content of 0.84 mg/kg was found in only one spherule, which was judged to be extraterrestrial in origin. A comparison of elemental compositions of the Antarctic spherules analyzed in this study with those of deep-sea sediment spherules and those of terrestrial materials revealed that most of the Antarctic spherules except for the sample in which iridium was detected could not be identified as extraterrestrial in origin.
Observation of Human Multi-Joint Arm Movement from the Viewpoint of a Riemannian Distance
Masahiro Sekimoto,Suguru Arimoto,Boris I. Prilutsky,Tadao Isaka,Sadao Kawamura 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper aims at analyzing dynamic characteristics of human arm movements from the viewpoint of Rie-manni an distance. In order to evaluate the amount of inertia-induced movement of a multi-joint arm, a measure called inertia-induced measure is developed. By applying the measure to actual human reaching, it is shown that the smooth reaching tends to be closer to the inertia-induced movement than the clumsy reaching. From this observation, it is sug-gested that humans use their own inertia properties efficiently in smooth reaching.
Measurement of High Energy Neutron Induced Cross Sections for Chromium
S. Sekimoto,T. Utsunomiya,H. Yashima,H. Joto,S. Shibata,K. Ninomiya,D. Satoh,Y. Iwamoto,T. Omoto,R. Nakagaki,N. Takahashi,A. Shinohara,T. Shima,M. Hagiwara,H. Matsumura,K. Nishiizumi,Y. Matsushi,H. Ma 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Reaction cross sections for Cr induced by neutrons at 287 MeV were measured by using ^7Li(p,n) reaction at N0 beam line in the Research Center for Nuclear Physics (RCNP), Osaka University. To estimate quasi-monoenergetic neutron-induced cross sections, the Cr sample was irradiated on the two angles of 0° and 30° for the axis of the primary proton beam. Proton-induced reaction cross sections for Cr at 300 MeV were also measured. The measured cross section data in the ^(nat)Cr(n,x) and ^(nat)Cr(p,x) reactions are compared with the literature values and the JENDL high-energy file. Furthermore, those in the ^(nat)Cr(n,x) reactions are also compared with those in the ^(nat)Cr(p,x) reaction.
Masahiro Sekimoto,Sadao Kawamura,Tomoya Ishitsubo,ShinsukeAkizuki,Masayuki Mizuno 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper aims at generating desired feedforward torque for a specified motion by reuse of time-series to rque data acquired by the iterative learning control. The suggested method named motion-scalet rans for mation realizes a motion to an arbitrarily specified posture of a two-DOF planar robot arm on the basis of arithmetical operations of time-series to rque of only four motions. The algorism is theoretically presented, and the effectiveness is confirmed in experiments. It is shown by the experimental results that the trajectory tracking error so fangular velocities by the motion-scalet rans formationt end to be smaller than those by the computed to rque method.
Mayuko Ogawa,Genko Oyama,Satoko Sekimoto,Taku Hatano,Nobutaka Hattori 대한파킨슨병및이상운동질환학회 2022 Journal Of Movement Disorders Vol.15 No.1
Using telemedicine is a way to improve the accessibility of specialists for patients with Parkinson’s disease (PD); however, it is not widely used in Japan. We investigated the efficacy of telemedicine in PD by using a single-center cross-sectional questionnaire survey.
Lee, Young Hoon,Shin, Jong Won,Sekimoto, Yusuke,Hayami, Shinya,Harrowfield, Jack,Kim, Yang Commonwealth Scientific and Industrial Research Or 2017 Australian journal of chemistry Vol.70 No.5
<P> Crystal structure determination on the mixed ligand complex [Ru(tpy)(L1)](ClO4)2 (tpy = 2,2′:6′,2″-terpyridine; L1 = 4′-(ferrocenylmethylaminomethylphenyl)terpyridine) shows the ferrocenyl group to be located as remotely as possible from the RuII centre. This may explain the fact that emission from the RuII centre is detectable even at room temperature in solution. </P>