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474 results on '"Yang, In-Sang"'

168. Study of spin-phonon coupling in LiFe1-xMnxPO4 olivines.

Author

Hien, Nguyen Thi Minh, Chung, Joo Hee, Chen, Xiang‐Bai, Kwon, Woo Jun, Kim, Chul Sung, and Yang, In‐Sang

Subjects
SPIN-phonon interactions, RAMAN spectroscopy, MANGANESE, CATALYTIC doping
Abstract

LiFe1-xMnxPO4 olivines are promising material for improved performance of Li-ion batteries. Spin-phonon coupling of LiFe1-xMnxPO4 (x = 0, 0.3, 0.5) olivines is studied through temperature-dependent Raman spectroscopy. Among the observed phononmodes, the external mode at ~263cm-1 is directly correlated with the motions of magnetic Fe2+/Mn2+ ions. This mode displays anomalous temperature-dependent behavior near the Néel temperature, indicating a coupling of this mode with spin ordering. As Mndoping increases, the anomalous behavior becomes clearly weaker, indicating the spin-phonon coupling quickly decreases. Our analyses showthat the quick decrease of spin-phonon coupling is due to decrease of the strength of spin-phonon coupling, but not change of spin-ordering feature with Mn doping. Importantly, we suggest that the low electrochemical activity of LiMnPO4 is correlated with the weak spin-phonon coupling strength, but not with the weak ferromagnetic ground state. Our work would play an important role as a guide in improving the performances of future Li-ion batteries. [ABSTRACT FROM AUTHOR]

Published
2015
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190. SW—Soil and Water

Author

Lee, Kwan Tun, primary, Lee, Chin-Dee, additional, Yang, Ming-Sang, additional, and Yu, Chih-Ching, additional

Published
2000
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193. System dependability analysis and evaluation

Author

Systems Engineering, Blanchard, Benjamin S. Jr., Fabrycky, Wolter J., Reasor, Roderick J., Yang, Joseph Sang-chin, Systems Engineering, Blanchard, Benjamin S. Jr., Fabrycky, Wolter J., Reasor, Roderick J., and Yang, Joseph Sang-chin

Abstract

Undependable systems are unable to accomplish the mission for which they were designed and cause tremendous loss [Airwar-Vietnam, 1978]. In most instances, timely maintenance is a vital necessity for a system to be kept in or returned to its operating condition, and to be able to successfully complete a specific mission. In a scarcer-resource but higher-competition environment, it is essential that system dependability be considered as a major system parameter and be evaluated during the early phases of the system design process. Given a specific system mission profile, whether or not the mission can be successfully completed is based not only on such measures as performance, reliability, maintainability, and/or availability. There is a need for system designers and engineers to meeasure system dependability, as well. System dependability is a measure of effectiveness which allows for the consideration of maintenance in the life cycle as long as it does not inhibit the system from fulfilling its mission. It is the aim of this project to develop a methodology for the analysis and evaluation of system effectiveness through the utilization of the system dependability measure. The concept and the mathematical model of system dependability is discussed. Effectiveness factors and relationships are described, a measure of system dependability has been defined, and a computer -based tool was developed to enable the accomplishment of trade-off analyses and the evaluation of various system configurations in terms of dependability. Maintenance requirements are addressed through the introduction of various combinations of failures, and failure distributions include the consideration of the exponential, Weibull, and log-normal cases. Application of the dependability model is illustrated through a case study involving an aircraft radar trated through a case study involving an aircraft radar is illustrated through a case study involving an aircraft radar subsystem as an example.

Published
1994

199. Raman study of the Hg0.7Cr0.3Sr2CuO4+δ superconductors

Author

Lee, Soo-Young, primary, Chang, Bo-Youn, additional, Yang, In-Sang, additional, Gwak, Ji-Hye, additional, Kim, Sung-Jin, additional, Choi, Jae-Hyuk, additional, Lee, Sung-Ik, additional, Yakhmi, J.V., additional, Mandal, J.B., additional, Bandyopadhyay, B., additional, and Ghosh, B., additional

Published
1997
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