Influence of intramolecular vibrations in third-order, time-domain resonant spectroscopies. II. Numerical calculations

2001 ◽  
Vol 114 (18) ◽  
pp. 8020-8039 ◽  
Author(s):  
Kaoru Ohta ◽  
Delmar S. Larsen ◽  
Mino Yang ◽  
Graham R. Fleming
Keyword(s):  
Time Domain ◽  
Numerical Calculations ◽  
Third Order ◽  
Intramolecular Vibrations

Influence of intramolecular vibrations in third-order, time-domain resonant spectroscopies. I. Experiments

2001 ◽  
Vol 114 (18) ◽  
pp. 8008-8019 ◽  
Author(s):  
Delmar S. Larsen ◽  
Kaoru Ohta ◽  
Qing-Hua Xu ◽  
Michelle Cyrier ◽  
Graham R. Fleming
Keyword(s):  
Time Domain ◽  
Third Order ◽  
Intramolecular Vibrations

X-ray third-order nonlinear plane-wave Bragg-case dynamical diffraction effects in a perfect crystal

2015 ◽  
Vol 22 (6) ◽  
pp. 1410-1418 ◽  
Author(s):  
Minas K. Balyan
Keyword(s):  
Analytical Solution ◽  
Perfect Crystal ◽  
Total Reflection ◽  
Numerical Calculations ◽  
Third Order ◽  
Dynamical Diffraction ◽  
X Ray ◽  
Infinite Crystal ◽  
Nonlinear Plane ◽  
Diffraction Effects

Two-wave symmetric Bragg-case dynamical diffraction of a plane X-ray wave in a crystal with third-order nonlinear response to the electric field is considered theoretically. For certain diffraction conditions for a non-absorbing perfect semi-infinite crystal in the total reflection region an analytical solution is found. For the width and for the center of the total reflection region expressions on the intensity of the incidence wave are established. It is shown that in the nonlinear case the total reflection region exists below a maximal intensity of the incidence wave. With increasing intensity of the incidence wave the total reflection region's center moves to low angles and the width decreases. Using numerical calculations for an absorbing semi-infinite crystal, the behavior of the reflected wave as a function of the intensity of the incidence wave and of the deviation parameter from the Bragg condition is analyzed. The results of numerical calculations are compared with the obtained analytical solution.

Numerical Study on Sea Keeping Performances of Ship by Exact Linear 3-D Potential Method

2007 ◽  
Author(s):  
N. M. Golam Zakaria ◽  
M. S. Baree
Keyword(s):  
Frequency Domain ◽  
Wave Height ◽  
Time Domain ◽  
Domain Analysis ◽  
Potential Method ◽  
Frequency Domain Analysis ◽  
Numerical Calculations ◽  
Irregular Waves ◽  
Linear Potential ◽  
Time Domain Simulation

This paper deals with the numerical calculations of sea-keeping performances of ship in irregular sea condition. Here linear potential theory has been applied for describing the fluid motion and 3-D sink-source technique has been used to determine hydrodynamic forces for surface ship advancing in waves at constant forward speed. Numerical coding based on 3-D potential method has been tested in an extensive manner keeping an eye with the criteria recommended by various ITTC committees [1]. The numerical accuracy of the coding has been examined using some experiment results as well as some other contemporary numerical calculations given by some authors for the case of frequency domain analysis. Taking a typical Panamax Container Vessel and in order to simulate its sea-keeping performances in real sea condition, the frequency domain analysis has been performed. The result is then used for time domain simulation in short crested irregular waves. Unequal frequency spacing has been taken into account to get longer simulation time and also empirical nonlinear roll damping has been taken in the way of time domain simulation. From this time domain simulation, relative wave height has been calculated which could sometimes damage deck equipment as well as posing a risks to personnel in severe sea condition. The effect of speed & wave direction on relative wave height has been considered and finally the numerical results of the maximum and significant values of irregular relative wave heights for these conditions are discussed.

QUADRATIC ELECTRO-OPTIC EFFECTS IN ZnS/CdSe/ ZnS CYLINDRICAL NANOSHELLS

2012 ◽  
Vol 26 (11) ◽  
pp. 1250074 ◽  
Author(s):  
A. BAHARI ◽  
Z. SOLTANI MOGHADAM
Keyword(s):  
Relaxation Time ◽  
Photon Energy ◽  
Numerical Calculations ◽  
Nonlinear Susceptibility ◽  
Third Order ◽  
The Third ◽  
Electro Optic ◽  
Third Order Nonlinearity ◽  
Third Order Nonlinear Susceptibility

The third-order nonlinearity susceptibility is obtained as a function of wavelength for ZnS / CdSe / ZnS structure. Numerical calculations show that the nonlinear susceptibility of this structure depends on parameters such as structure size, relaxation time and pump photon energy. The intensity and position of third-order nonlinear susceptibility peaks depend on shell thicknesses; smaller thicknesses have peak susceptibility at shorter wavelength.

Determination of third-order nonlinear susceptibilityχ(3)through measurements in the picosecond time domain

1984 ◽  
Vol 30 (12) ◽  
pp. 7358-7361 ◽  
Author(s):  
B. K. Rhee ◽  
W. E. Bron ◽  
J. Kuhl
Keyword(s):  
Time Domain ◽  
Third Order

4-Channel, time-domain measurement system using track and hold amplifier for the characterization and linearization of high-power amplifiers

2011 ◽  
Vol 4 (1) ◽  
pp. 71-79 ◽  
Author(s):  
Sajjad Ahmed ◽  
Mohammad Saad El Dine ◽  
Guillaume Neveux ◽  
Tibault Reveyrand ◽  
Denis Barataud ◽  
...  
Keyword(s):  
Measurement System ◽  
Time Domain ◽  
Power Amplifiers ◽  
Test Bench ◽  
Dynamic Range ◽  
Circuit Complexity ◽  
Third Order ◽  
Transfer Characteristics ◽  
Rf Signals ◽  
Phase Amplitude

We propose in this paper a 4-channel time-domain test bench for the characterization and linearity enhancement of microwave power amplifiers (PAs). The proposed time-domain measurement system utilizes four track and hold amplifiers (THAs) for direct subsampling of radiofrequency (RF) signals. The use of wideband THAs to replace samplers or mixers enables reducing analog IF circuit complexity. It permits direct digitization of RF signals like CW, two-tone and pulsed modulated signals, bringing more flexibility in the receiver's performance by enhancing the dynamic range and bandwidth. This test bench is capable of completely extracting the phase, amplitude, and transfer characteristics of non-linear devices excited with CW or modulated RF signals. In this work, two-tone transfer characteristics of a 50 W GaN HEMT Nitronex PA were extracted and processed for applying digital pre-distortion linearization to enhance linearity performance. Time-domain envelope and carrier waveforms (voltage and current) along with third-order inter-modulation distortion (IMD) products with and without digital pre-distortion scheme are also presented.

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