The Experts below are selected from a list of 62793 Experts worldwide ranked by ideXlab platform
Mamoru Mabuchi - One of the best experts on this subject based on the ideXlab platform.
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Bond Mobility Mechanism in grain boundary embrittlement: First-principles tensile tests of Fe with a P-segregated {Sigma}3 grain boundary
Physical Review B, 2010Co-Authors: Motohiro Yuasa, Mamoru MabuchiAbstract:First-principles simulated tensile tests have been performed on Fe with a P-segregated grain boundary to investigate the nature of the bond Mobility Mechanism in grain boundary embrittlement. The first site for bond breaking was the Fe-P bond, despite its high charge density. This is because the Fe-P bond exhibited the covalentlike characteristics of a localized bonding and the Mobility of electrons was reduced. The breaking of the Fe-P bond accelerated the breaking of the Fe-Fe bond around the Fe-P bond because the Fe-P bond breaking affected the electron density of states of the Fe-Fe bond. Thus, P segregation enhanced the grain boundary embrittlement in Fe.
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bond Mobility Mechanism in grain boundary embrittlement first principles tensile tests of fe with a p segregated sigma 3 grain boundary
Physical Review B, 2010Co-Authors: Motohiro Yuasa, Mamoru MabuchiAbstract:First-principles simulated tensile tests have been performed on Fe with a P-segregated grain boundary to investigate the nature of the bond Mobility Mechanism in grain boundary embrittlement. The first site for bond breaking was the Fe-P bond, despite its high charge density. This is because the Fe-P bond exhibited the covalentlike characteristics of a localized bonding and the Mobility of electrons was reduced. The breaking of the Fe-P bond accelerated the breaking of the Fe-Fe bond around the Fe-P bond because the Fe-P bond breaking affected the electron density of states of the Fe-Fe bond. Thus, P segregation enhanced the grain boundary embrittlement in Fe.
Motohiro Yuasa - One of the best experts on this subject based on the ideXlab platform.
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Bond Mobility Mechanism in grain boundary embrittlement: First-principles tensile tests of Fe with a P-segregated {Sigma}3 grain boundary
Physical Review B, 2010Co-Authors: Motohiro Yuasa, Mamoru MabuchiAbstract:First-principles simulated tensile tests have been performed on Fe with a P-segregated grain boundary to investigate the nature of the bond Mobility Mechanism in grain boundary embrittlement. The first site for bond breaking was the Fe-P bond, despite its high charge density. This is because the Fe-P bond exhibited the covalentlike characteristics of a localized bonding and the Mobility of electrons was reduced. The breaking of the Fe-P bond accelerated the breaking of the Fe-Fe bond around the Fe-P bond because the Fe-P bond breaking affected the electron density of states of the Fe-Fe bond. Thus, P segregation enhanced the grain boundary embrittlement in Fe.
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bond Mobility Mechanism in grain boundary embrittlement first principles tensile tests of fe with a p segregated sigma 3 grain boundary
Physical Review B, 2010Co-Authors: Motohiro Yuasa, Mamoru MabuchiAbstract:First-principles simulated tensile tests have been performed on Fe with a P-segregated grain boundary to investigate the nature of the bond Mobility Mechanism in grain boundary embrittlement. The first site for bond breaking was the Fe-P bond, despite its high charge density. This is because the Fe-P bond exhibited the covalentlike characteristics of a localized bonding and the Mobility of electrons was reduced. The breaking of the Fe-P bond accelerated the breaking of the Fe-Fe bond around the Fe-P bond because the Fe-P bond breaking affected the electron density of states of the Fe-Fe bond. Thus, P segregation enhanced the grain boundary embrittlement in Fe.
Dennis W Hong - One of the best experts on this subject based on the ideXlab platform.
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OmBURo: A Novel Unicycle Robot with Active Omnidirectional Wheel
arXiv: Robotics, 2020Co-Authors: Junjie Shen, Dennis W HongAbstract:A Mobility Mechanism for robots to be used in tight spaces shared with people requires it to have a small footprint, to move omnidirectionally, as well as to be highly maneuverable. However, currently there exist few such Mobility Mechanisms that satisfy all these conditions well. Here we introduce Omnidirectional Balancing Unicycle Robot (OmBURo), a novel unicycle robot with active omnidirectional wheel. The effect is that the unicycle robot can drive in both longitudinal and lateral directions simultaneously. Thus, it can dynamically balance itself based on the principle of dual-axis wheeled inverted pendulum. This letter discloses the early development of this novel unicycle robot involving the overall design, modeling, and control, as well as presents some preliminary results including station keeping and path following. With its very compact structure and agile Mobility, it might be the ideal locomotion Mechanism for robots to be used in human environments in the future.
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ICRA - OmBURo: A Novel Unicycle Robot with Active Omnidirectional Wheel
2020 IEEE International Conference on Robotics and Automation (ICRA), 2020Co-Authors: Junjie Shen, Dennis W HongAbstract:A Mobility Mechanism for robots to be used in tight spaces shared with people requires it to have a small footprint, to move omnidirectionally, as well as to be highly maneuverable. However, currently there exist few such Mobility Mechanisms that satisfy all these conditions well. Here we introduce Omnidirectional Balancing Unicycle Robot (OmBURo), a novel unicycle robot with active omnidirectional wheel. The effect is that the unicycle robot can drive in both longitudinal and lateral directions simultaneously. Thus, it can dynamically balance itself based on the principle of dual-axis wheeled inverted pendulum. This paper discloses the early development of this novel unicycle robot involving the overall design, modeling, and control, as well as presents some preliminary results including station keeping and path following. With its very compact structure and agile Mobility, it might be the ideal locomotion Mechanism for robots to be used in human environments in the future.
J.r. Galvele - One of the best experts on this subject based on the ideXlab platform.
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Reply to “Notes on the discussion concerning ‘surface Mobility Mechanism’ of stress corrosion cracking”, by E.M. Gutman
Corrosion Science, 2003Co-Authors: J.r. GalveleAbstract:Abstract The reply to the criticisms made by Gutman to the surface Mobility stress corrosion cracking (SCC) model is used as an opportunity to discuss areas that are considered obscure or underdeveloped in the present day SCC literature. One of the major limitations is the absence of a reliable description, at a molecular level, of the tip of the cracks. This description should include not only the stressed metal, but also the environment.
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Stress corrosion cracking of Ag-xAu alloys in one molar KCl, KBr and KI solutions
1995Co-Authors: J.r. Galvele, I. A. Maier, S. A. FernandezAbstract:Silver-gold alloys, with gold contents from 2.2 up to 60 at.%, are susceptible to stress corrosion cracking (SCC) in 1M KCl, 1M KBr and 1 M KI aqueous solutions. Cracks are mainly intergranular, and there is no evidence of a minimum value of gold content, below which no SCC could be observed. According to the surface Mobility Mechanism, up to 15 at.% gold, the surface Mobility of silver, induced by the environment, is the rate controlling step. For higher gold contents, gold surface Mobility starts to play an increasing role, and above 60 at.% it becomes rate controlling.
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Comments on “notes on the surface Mobility Mechanism of stress-corrosion cracking”, by K. Sieradzki and F. J. Friedersdorf
Corrosion Science, 1994Co-Authors: J.r. GalveleAbstract:Abstract Sieradzki and Friedersdorf's work is analysed. It is made evident that these authors have assumed thermodynamic equilibrium conditions for surfaces undergoing a corrosion process. It is also shown that vacancies are being injected into the considered metal surfaces during the corrosion process, and that the equations used by Sieradzki and Friedersdorf to calculate the vacancy surface concentration are not applicable. The equations used in the surface-Mobility stress corrosion cracking Mechanism are reviewed, and it is concluded that these equations are valid.
Cao Juncheng - One of the best experts on this subject based on the ideXlab platform.
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Model and modeling of low temperature current gain of polysilicon emitter bipolar transistors
Journal of Electronics (China), 1994Co-Authors: Huang Liuxing, Wei Tongli, Zheng Jiang, Cao JunchengAbstract:A unified model of low temperature current gain of polysilicon emitter bipolar transistors based on effective recombination method is presented, incorporating band-gap narrowing, carrier freezing-out, tunneling of holes through polysilicon/silicon interface oxide layer and reduced Mobility Mechanism in polysilicon. The modeling results based on this model are in good agreement with experimental data.