scholarly journals Time-Dependent Fifth-Order Bands in Nominally Third-Order 2D IR Vibrational Echo Spectra

2011 ◽  
Vol 115 (34) ◽  
pp. 9714-9723 ◽  
Author(s):  
Megan C. Thielges ◽  
Michael D. Fayer
Keyword(s):  
Time Dependent ◽  
Third Order ◽  
2D Ir ◽  
Fifth Order ◽  
Vibrational Echo

Dynamic Analysis of Non-Uniform Beams With Time Dependent Elastic Boundary Conditions

1995 ◽  
Author(s):  
Sen Yung Lee ◽  
Shueei Muh Lin
Keyword(s):  
Boundary Conditions ◽  
Time Dependent ◽  
Polynomial Functions ◽  
Third Order ◽  
The Third ◽  
Elastic Boundary ◽  
Order Degree ◽  
Elastically Restrained ◽  
Fifth Order ◽  
Elastic Boundary Conditions

Abstract The dynamic response of a non-uniform beam with time dependent elastic boundary conditions is studied by generalizing the method of Mindlin-Goodman and utilizing the exact solutions of general elastically restrained non-uniform beams given by Lee and Kuo. The time dependent elastic boundary conditions for the beam are formulated. A general form of change of dependent variable is introduced and the shifting polynomials of the third order degree, instead of the fifth order degree polynomials taken by Mindlin-Goodman, are selected. The physical meaning of these shifting polynomial functions are explored. Finally, the limiting cases are discussed and several examples are given to illustrate the analysis.

Dynamic Analysis of Nonuniform Beams With Time-Dependent Elastic Boundary Conditions

1996 ◽  
Vol 63 (2) ◽  
pp. 474-478 ◽  
Author(s):  
Sen Yung Lee ◽  
Shueei Muh Lin
Keyword(s):  
Boundary Conditions ◽  
Time Dependent ◽  
Polynomial Functions ◽  
Third Order ◽  
Elastic Boundary ◽  
Order Degree ◽  
Elastically Restrained ◽  
Fifth Order ◽  
Nonuniform Beam ◽  
Elastic Boundary Conditions

The dynamic response of a nonuniform beam with time-dependent elastic boundary conditions is studied by generalizing the method of Mindlin-Goodman and utilizing the exact solutions of general elastically restrained nonuniform beams given by Lee and Kuo. The time-dependent elastic boundary conditions for the beam are formulated. A general form of change of dependent variable is introduced and the shifting polynomials of the third-order degree, instead of the fifth-order degree polynomials taken by Mindlin-Goodman, are selected. The physical meaning of these shifting polynomial functions are explored. Finally, the limiting cases are discussed and several examples are given to illustrate the analysis.

scholarly journals Ultrafast 2D IR Vibrational Echo Spectroscopy

ChemInform ◽  
2007 ◽  
Vol 38 (16) ◽  
Author(s):  
Junrong Zheng ◽  
Kyungwon Kwak ◽  
M. D. Fayer
Keyword(s):  
2D Ir ◽  
Vibrational Echo

scholarly journals Vibrational dynamics and solvatochromism of the label SCN in various solvents and hemoglobin by time dependent IR and 2D-IR spectroscopy

2014 ◽  
Vol 16 (36) ◽  
pp. 19643-19653 ◽  
Author(s):  
Luuk J. G. W. van Wilderen ◽  
Daniela Kern-Michler ◽  
Henrike M. Müller-Werkmeister ◽  
Jens Bredenbeck
Keyword(s):  
Hydrogen Bonding ◽  
Ir Spectroscopy ◽  
Structural Dynamics ◽  
Spectral Diffusion ◽  
Time Dependent ◽  
Vibrational Dynamics ◽  
2D Ir

The vibrational label SCN is used to report on local structural dynamics in a protein revealing spectral diffusion on a picosecond scale. The SCN spectra are compared to the response of methylthiocyanate in solvents with different polarity and hydrogen-bonding capabilities.

scholarly journals Design and Analysis of a Repetitive Current Controller for a Single-Phase Bridgeless SEPIC PFC Converter

Energies ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 131 ◽  
Author(s):  
Jinwoo Kim ◽  
Sanghun Han ◽  
Wontae Cho ◽  
Younghoon Cho ◽  
Hyunsoo Koh
Keyword(s):  
Controller Design ◽  
Harmonic Distortion ◽  
Input Current ◽  
Order Model ◽  
Third Order ◽  
Current Controller ◽  
The Stability ◽  
Small Signal Modeling ◽  
Fifth Order ◽  
Repetitive Controller

This paper studies a repetitive controller design scheme for a bridgeless single-ended primary inductor converter (SEPIC) power factor correction (PFC) converter to mitigate input current distortions. A small signal modeling of the converter is performed by a fifth-order model. Since the fifth-order model is complex to be applied in designing a current controller, the model is approximated to a third-order model. Using the third-order model, the repetitive controller is designed to reduce the input current distortion. Then, the stability of the repetitive controller is verified with an error transfer function. The proposed controller performance is validated by simulation, and the experiment results show that the input current total harmonic distortion (THD) is improved by applying the proposed controller for an 800 W bridgeless SEPIC PFC converter prototype.

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