Browsing by Author "Yu, JK"

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Highly efficient red phosphorescent osmium(II) complexes for OLED applications
(2004-07-19)
Tung, YL
;
Wu, PC
;
Liu, CS
;
Chi, Y
;
Yu, JK
The nonionic, red-emitting complexes [Os(fppz)(2)L-2] (L = PPh2Me (1), PPhMe2 (2)) and [Os(bptz)(2)L-2] (L = PPh2Me (3)) were synthesized, showing highly intense red phosphorescent emission in CH2Cl2 solution at lambda(max) 617, 632, and 649 nm, respectively. The electroluminescent properties of these compounds on OLEDs showed promising device efficiencies required for future OLED applications.
Pragmatical asymptotical stability theorem with application to satellite system
(1999-10-01)
Ge, ZM
;
Yu, JK
;
Chen, YT
;
機械工程學系
;
Department of Mechanical Engineering
The motion stability of many actual dynamical systems may not be mathematical asymptotical stability in tradition, but it is actual asymptotical stability, namely, pragmatical asymptotical stability, which can be introduced by the concept of probability. To fill the gap between the tradictional idealized mathematical models and the actual reality of dynamical systems, a pragmatical asymptotical stability theorem is given with application to satellite system.
Pragmatical asymptotical stability theorem with application to satellite system (vol 38, pg 6178, 1999)
(1999-12-01)
Ge, ZM
;
Yu, JK
;
Chen, YT
;
機械工程學系
;
Department of Mechanical Engineering
Pragmatical asymptotical stability theorems on partial region and for partial variables with applications to gyroscopic systems
(2000-12-01)
Ge, ZM
;
Yu, JK
;
機械工程學系
;
Department of Mechanical Engineering
For a long time, all stability theorems are concerned with the stability of the zero solution of the differential equations of disturbed motion on the whole region of the neighborhood of the origin. But for various problems of dynamical systems, the stability is actually on partial region. In other words, the traditional mathematical model is unmatched with the dynamical reality and artificially sets too strict demand which is unnecessary. Besides, although the stability for many problems of dynamical systems may not be mathematical asymptotical stability, it is actual asymptotical stability - namely "pragmatical asymptotical stability", which can be introduced by the concept of probability. In order to fill the gap between the traditional mathematical model and dynamical reality of various systems, one pragmatical asymptotical stability theorem on partial region and one pragmatical asymptotical stability theorem on partial region for partial variables are given and applications for gyroscope systems are presented.
Spectroscopy and femtosecond dynamics of type-II CdSe/ZnTe core-shell semiconductor synthesized via the CdO precursor
(2004-07-29)
Chen, CY
;
Cheng, CT
;
Yu, JK
;
Pu, SC
;
Cheng, YM
CdSe/ZnTe type-II quantum dots (QDs) synthesized via the CdO precursor are reported. Spectroscopic and femtosecond dynamic measurements reveal that the rate of photoinduced electron/hole spatial separation decreases with increases in the size of the core, and it is independent of the thickness of the shell in the CdSe/ZnTe QDs. The results are consistent with the binding strength of the electron and hole confined at the center of CdSe. The correlation between the core/shell size and the electron/hole spatial separation rate resolved in this study may provide valuable information for applications where rapid photoinduced carrier separation followed by charge transfer into a matrix or electrode is crucial, such as in photovoltaic devices.
Three asymptotical stability theorems on partial region with applications
(1998-05-01)
Ge, ZM
;
Yu, JK
;
Chen, HK
;
機械工程學系
;
Department of Mechanical Engineering
For a long time, all stability theorems are concerned with the stability of the zero solution of the differential equations of disturbed motion on the whole region of the neighborhood of the origin. But for various problems of dynamical systems, the stability is actually on partial region. In other words, the traditional mathematical model is unmatched with the dynamical reality and artificially sets too strict demand which is unnecessary. In order to fill the gap between the traditional mathematical model and dynamical reality of various systems, three asymptotical stability theorems on partial region are given and nine applications are presented.