scholarly journals Low-Frequency Normal Mode Reverberation Model

2015 ◽  
Vol 34 (3) ◽  
pp. 184 ◽  
Author(s):  
Oh
Keyword(s):  
Normal Mode ◽  
Low Frequency

THZ-FREQUENCY SPECTROSCOPIC SENSING OF DNA AND RELATED BIOLOGICAL MATERIALS

2003 ◽  
Vol 13 (04) ◽  
pp. 903-936 ◽  
Author(s):  
T. GLOBUS ◽  
D. WOOLARD ◽  
M. BYKHOVSKAIA ◽  
B. GELMONT ◽  
L. WERBOS ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Normal Mode ◽  
Normal Mode Analysis ◽  
Low Frequency ◽  
Biological Materials ◽  
Mode Analysis ◽  
Resonance Structure ◽  
Terahertz Frequency ◽  
Dna Molecules ◽  
Phonon Modes

The terahertz frequency absorption spectra of DNA molecules reflect low-frequency internal helical vibrations involving rigidly bound subgroups that are connected by the weakest bonds, including the hydrogen bonds of the DNA base pairs, and/or non-bonded interactions. Although numerous difficulties make the direct identification of terahertz phonon modes in biological materials very challenging, recent studies have shown that such measurements are both possible and useful. Spectra of different DNA samples reveal a large number of modes and a reasonable level of sequence-specific uniqueness. This chapter utilizes computational methods for normal mode analysis and theoretical spectroscopy to predict the low-frequency vibrational absorption spectra of short artificial DNA and RNA. Here the experimental technique is described in detail, including the procedure for sample preparation. Careful attention was paid to the possibility of interference or etalon effects in the samples, and phenomena were clearly differentiated from the actual phonon modes. The results from Fourier-transform infrared spectroscopy of DNA macromolecules and related biological materials in the terahertz frequency range are presented. In addition, a strong anisotropy of terahertz characteristics is demonstrated. Detailed tests of the ability of normal mode analysis to reproduce RNA vibrational spectra are also conducted. A direct comparison demonstrates a correlation between calculated and experimentally observed spectra of the RNA polymers, thus confirming that the fundamental physical nature of the observed resonance structure is caused by the internal vibration modes in the macromolecules. Application of artificial neural network analysis for recognition and discrimination between different DNA molecules is discussed.

Source models of great earthquakes from ultra low-frequency normal mode data

2014 ◽  
Vol 233 ◽  
pp. 41-67 ◽  
Author(s):  
K. Lentas ◽  
A.M.G. Ferreira ◽  
E. Clévédé ◽  
J. Roch
Keyword(s):  
Normal Mode ◽  
Low Frequency ◽  
Great Earthquakes ◽  
Source Models

scholarly journals Identification of interference normal mode pairs of low frequency sound in shallow water

2019 ◽  
Vol 68 (13) ◽  
pp. 134304
Author(s):  
Rui-Jie Meng ◽  
Shi-Hong Zhou ◽  
Feng-Hua Li ◽  
Yu-Bo Qi
Keyword(s):  
Shallow Water ◽  
Normal Mode ◽  
Low Frequency ◽  
Frequency Sound

Statistics of acoustic normal mode energy for low frequency long range propagation in the ocean: Comparisons between observations and theory.

2010 ◽  
Vol 128 (4) ◽  
pp. 2395-2395
Author(s):  
Tarun K. Chandrayadula ◽  
John A. Colosi ◽  
Peter F. Worcester ◽  
Matthew A. Dzieciuch ◽  
James A. Mercer ◽  
...  
Keyword(s):  
Long Range ◽  
Normal Mode ◽  
Low Frequency ◽  
Mode Energy

Low Frequency Raman Spectra in Water by Normal Mode Analysis

1994 ◽  
pp. 197-203
Author(s):  
Srikanth Sastry ◽  
H. Eugene Stanley ◽  
Francesco Sciortino
Keyword(s):  
Raman Spectra ◽  
Normal Mode ◽  
Normal Mode Analysis ◽  
Low Frequency ◽  
Mode Analysis

A minimal coarse-grained model for the low-frequency normal mode analysis of icosahedral viral capsids

Soft Matter ◽  
2020 ◽  
Vol 16 (14) ◽  
pp. 3443-3455 ◽  
Author(s):  
M. Martín-Bravo ◽  
J. M. Gomez Llorente ◽  
J. Hernández-Rojas
Keyword(s):  
Structural Properties ◽  
Normal Mode ◽  
Normal Mode Analysis ◽  
Low Frequency ◽  
Coarse Grained ◽  
Mode Analysis ◽  
Viral Capsids ◽  
Mode Spectrum ◽  
Coarse Grained Model

A minimal coarse-grained model unveils relevant structural properties of icosahedral viral capsids when fitted to reproduce their low-frequency normal-mode spectrum.

Low frequency depolarized Raman spectra in water: Results from normal mode analysis

1994 ◽  
Vol 100 (7) ◽  
pp. 5361-5366 ◽  
Author(s):  
Srikanth Sastry ◽  
H. Eugene Stanley ◽  
Francesco Sciortino
Keyword(s):  
Raman Spectra ◽  
Normal Mode ◽  
Normal Mode Analysis ◽  
Low Frequency ◽  
Mode Analysis
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