The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Ikuo Mizuuchi - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the 1-Joint Spring-Motor Coupling System and Optimization Criteria Focusing on the Velocity Increasing Effect
Journal of the Robotics Society of Japan, 2011Co-Authors: Takatoshi Hondo, Ikuo MizuuchiAbstract:This paper describes analysis and design criteria of the 1-Joint Spring-Motor Coupling System (SMCS). A system including series elastic elements shows vibrational responses in the velocity space, and our concept is to use the velocity peak of the system for motions that need explosive power. By tuning parameters, we can obtain instantaneously higher velocity than without any spring. We constructed a mathematical model of a 1-Joint SMCS (including motor electrical properties) and confirmed the velocity increasing effect on SMCS by numerical analyses and real experiments. And we discovered existence of the most Effective Inertia balance between the motor shaft and the robot link, and proposed the optimum spring constant with consideration of the moveable range of the link. We confirmed the validity and the limitation of the criteria by the real experiments.
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ICRA - Analysis of the 1-Joint Spring-Motor Coupling System and optimization criteria focusing on the velocity increasing effect
2011 IEEE International Conference on Robotics and Automation, 2011Co-Authors: Takatoshi Hondo, Ikuo MizuuchiAbstract:This paper describes analysis and design criteria of the 1-Joint Spring-Motor Coupling System (SMCS). A system including series elastic elements shows vibrational responses in the velocity space, and our concept is to use the velocity peak of the system for motions that need explosive power. By tuning parameters, we can obtain instantaneously higher velocity than without any spring. We constructed a mathematical model of a 1-Joint SMCS (including motor electrical properties) and confirmed the velocity increasing effect on SMCS by numerical analyses and real experiments. And we discovered existence of the most Effective Inertia balance between the motor shaft and the robot link, and proposed the optimum spring constant with consideration of the moveable range of the link. We confirmed the validity and the limitation of the criteria by the real experiments.
Pierre-nicholas Roy - One of the best experts on this subject based on the ideXlab platform.
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Persistent molecular superfluid response in doped para-hydrogen clusters.
Physical review letters, 2012Co-Authors: Paul L Raston, Robert J. Le Roy, Wolfgang Jager, Pierre-nicholas RoyAbstract:Direct observation of superfluid response in para-hydrogen ($p\mathrm{\text{\ensuremath{-}}}{\mathrm{H}}_{2}$) remains a challenge because of the need for a probe that would not induce localization and a resultant reduction in superfluid fraction. Earlier work [H. Li, R. J. Le Roy, P.-N. Roy, and A. R. W. McKellar, Phys. Rev. Lett. 105, 133401 (2010)] has shown that carbon dioxide can probe the Effective Inertia of $p\mathrm{\text{\ensuremath{-}}}{\mathrm{H}}_{2}$ although larger clusters show a lower superfluid response due to localization. It is shown here that the lighter carbon monoxide probe molecule allows one to measure the Effective Inertia of $p\mathrm{\text{\ensuremath{-}}}{\mathrm{H}}_{2}$ clusters while maintaining a maximum superfluid response with respect to dopant rotation. Microwave spectroscopy and a theoretical analysis based on Feynman path-integral simulations are used to support this conclusion.
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persistent molecular superfluid response in doped para hydrogen clusters
Physical Review Letters, 2012Co-Authors: Paul L Raston, Wolfgang Jager, R Le J Roy, Pierre-nicholas RoyAbstract:Direct observation of superfluid response in para-hydrogen (p-H(2)) remains a challenge because of the need for a probe that would not induce localization and a resultant reduction in superfluid fraction. Earlier work [H. Li, R. J. Le Roy, P.-N. Roy, and A. R. W. McKellar, Phys. Rev. Lett. 105, 133401 (2010)] has shown that carbon dioxide can probe the Effective Inertia of p-H(2) although larger clusters show a lower superfluid response due to localization. It is shown here that the lighter carbon monoxide probe molecule allows one to measure the Effective Inertia of p-H(2) clusters while maintaining a maximum superfluid response with respect to dopant rotation. Microwave spectroscopy and a theoretical analysis based on Feynman path-integral simulations are used to support this conclusion.
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Molecular superfluid: nonclassical rotations in doped para-hydrogen clusters.
Physical review letters, 2010Co-Authors: Robert J. Le Roy, Pierre-nicholas Roy, A. R. W. MckellarAbstract:Clusters of para-hydrogen (pH 2 ) have been predicted to exhibit superfluid behavior, but direct observation of this phenomenon has been elusive. Combining experiments and theoretical simulations, we have determined the size evolution of the superfluid response of pH 2 clusters doped with carbon dioxide (CO 2 ). Reduction of the Effective Inertia is observed when the dopant is surrounded by the pH 2 solvent. This marks the onset of molecular superfluidity in pH 2 . The fractional occupation of solvation rings around CO 2 correlates with enhanced superfluid response for certain cluster sizes.
Tatara - One of the best experts on this subject based on the ideXlab platform.
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Spin Dynamics with Inertia in Metallic Ferromagnets
Physical Review B, 2015Co-Authors: Toru Kikuchi, TataraAbstract:Non-adiabatic contribution of environmental degrees of freedom yields Effective Inertia of spin in Effective spin dynamics. In this paper, we study several aspects of the Inertia of spin in metallic ferromagnets. (i) a concrete expression of the spin Inertia $m_s$: $m_s=\hbar S_c/(2g_{\rm sd})$, where $S_c$ is the spin polarization of conduction electrons and $g_{\rm sd}$ is the $sd$ coupling constant. (ii) dynamical behavior of spin with Inertia, discussed from viewpoints of a spinning top and of a particle on a sphere. (iii) behavior of spin waves and domain walls in the presence of Inertia, and behavior of spin with Inertia in the case of a time-dependent magnetic field.
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Spin dynamics with Inertia in metallic ferromagnets
Physical Review B, 2015Co-Authors: Toru Kikuchi, TataraAbstract:The nonadiabatic contribution of environmental degrees of freedom yields an Effective Inertia of spin in the Effective spin dynamics. In this paper, we study several aspects of the Inertia of spin in metallic ferromagnets: (i) a concrete expression of the spin Inertia ${m}_{s}$: ${m}_{s}=\ensuremath{\hbar}{S}_{c}/(2{g}_{\mathrm{sd}})$, where ${S}_{c}$ is the spin polarization of conduction electrons and ${g}_{\mathrm{sd}}$ is the $sd$ coupling constant; (ii) a dynamical behavior of spin with Inertia, discussed from the viewpoints of a spinning top and of a particle on a sphere; (iii) the behavior of spin waves and domain walls in the presence of Inertia and the behavior of spin with Inertia under a time-dependent magnetic field.
Takatoshi Hondo - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the 1-Joint Spring-Motor Coupling System and Optimization Criteria Focusing on the Velocity Increasing Effect
Journal of the Robotics Society of Japan, 2011Co-Authors: Takatoshi Hondo, Ikuo MizuuchiAbstract:This paper describes analysis and design criteria of the 1-Joint Spring-Motor Coupling System (SMCS). A system including series elastic elements shows vibrational responses in the velocity space, and our concept is to use the velocity peak of the system for motions that need explosive power. By tuning parameters, we can obtain instantaneously higher velocity than without any spring. We constructed a mathematical model of a 1-Joint SMCS (including motor electrical properties) and confirmed the velocity increasing effect on SMCS by numerical analyses and real experiments. And we discovered existence of the most Effective Inertia balance between the motor shaft and the robot link, and proposed the optimum spring constant with consideration of the moveable range of the link. We confirmed the validity and the limitation of the criteria by the real experiments.
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ICRA - Analysis of the 1-Joint Spring-Motor Coupling System and optimization criteria focusing on the velocity increasing effect
2011 IEEE International Conference on Robotics and Automation, 2011Co-Authors: Takatoshi Hondo, Ikuo MizuuchiAbstract:This paper describes analysis and design criteria of the 1-Joint Spring-Motor Coupling System (SMCS). A system including series elastic elements shows vibrational responses in the velocity space, and our concept is to use the velocity peak of the system for motions that need explosive power. By tuning parameters, we can obtain instantaneously higher velocity than without any spring. We constructed a mathematical model of a 1-Joint SMCS (including motor electrical properties) and confirmed the velocity increasing effect on SMCS by numerical analyses and real experiments. And we discovered existence of the most Effective Inertia balance between the motor shaft and the robot link, and proposed the optimum spring constant with consideration of the moveable range of the link. We confirmed the validity and the limitation of the criteria by the real experiments.
Toru Kikuchi - One of the best experts on this subject based on the ideXlab platform.
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Spin Dynamics with Inertia in Metallic Ferromagnets
Physical Review B, 2015Co-Authors: Toru Kikuchi, TataraAbstract:Non-adiabatic contribution of environmental degrees of freedom yields Effective Inertia of spin in Effective spin dynamics. In this paper, we study several aspects of the Inertia of spin in metallic ferromagnets. (i) a concrete expression of the spin Inertia $m_s$: $m_s=\hbar S_c/(2g_{\rm sd})$, where $S_c$ is the spin polarization of conduction electrons and $g_{\rm sd}$ is the $sd$ coupling constant. (ii) dynamical behavior of spin with Inertia, discussed from viewpoints of a spinning top and of a particle on a sphere. (iii) behavior of spin waves and domain walls in the presence of Inertia, and behavior of spin with Inertia in the case of a time-dependent magnetic field.
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Spin dynamics with Inertia in metallic ferromagnets
Physical Review B, 2015Co-Authors: Toru Kikuchi, TataraAbstract:The nonadiabatic contribution of environmental degrees of freedom yields an Effective Inertia of spin in the Effective spin dynamics. In this paper, we study several aspects of the Inertia of spin in metallic ferromagnets: (i) a concrete expression of the spin Inertia ${m}_{s}$: ${m}_{s}=\ensuremath{\hbar}{S}_{c}/(2{g}_{\mathrm{sd}})$, where ${S}_{c}$ is the spin polarization of conduction electrons and ${g}_{\mathrm{sd}}$ is the $sd$ coupling constant; (ii) a dynamical behavior of spin with Inertia, discussed from the viewpoints of a spinning top and of a particle on a sphere; (iii) the behavior of spin waves and domain walls in the presence of Inertia and the behavior of spin with Inertia under a time-dependent magnetic field.