Low-Frequency Dilational Elasticity of the Nematic 4‘-Pentyl-4-biphenylcarbonitrile (5CB)/Water Interface

Langmuir ◽  
2007 ◽  
Vol 23 (15) ◽  
pp. 7907-7910 ◽  
Author(s):  
Radwa Ibrahim El-Sadek ◽  
M. Roushdy ◽  
Jules J. Magda
Keyword(s):  
Low Frequency ◽  
Water Interface ◽  
Dilational Elasticity

Temperature Dependence of the Air/Water Interface Revealed by Polarization Sensitive Sum-Frequency Generation Spectroscopy

2018 ◽  
Author(s):  
Daniel R. Moberg ◽  
Shelby C. Straight ◽  
Francesco Paesani
Keyword(s):  
Temperature Dependence ◽  
Low Frequency ◽  
Potential Energy Function ◽  
Md Simulations ◽  
Sum Frequency Generation ◽  
Water Molecules ◽  
Water Interface ◽  
Sum Frequency ◽  
Air Water Interface ◽  
Frequency Generation

<div> <div> <div> <p>The temperature dependence of the vibrational sum-frequency generation (vSFG) spectra of the the air/water interface is investigated using many-body molecular dynamics (MB-MD) simulations performed with the MB-pol potential energy function. The total vSFG spectra calculated for different polarization combinations are then analyzed in terms of molecular auto-correlation and cross-correlation contributions. To provide molecular-level insights into interfacial hydrogen-bonding topologies, which give rise to specific spectroscopic features, the vSFG spectra are further investigated by separating contributions associated with water molecules donating 0, 1, or 2 hydrogen bonds to neighboring water molecules. This analysis suggests that the low frequency shoulder of the free OH peak which appears at ∼3600 cm−1 is primarily due to intermolecular couplings between both singly and doubly hydrogen-bonded molecules. </p> </div> </div> </div>

Temperature Dependence of the Air/Water Interface Revealed by Polarization Sensitive Sum-Frequency Generation Spectroscopy

2018 ◽  
Author(s):  
Daniel R. Moberg ◽  
Shelby C. Straight ◽  
Francesco Paesani
Keyword(s):  
Temperature Dependence ◽  
Low Frequency ◽  
Potential Energy Function ◽  
Md Simulations ◽  
Sum Frequency Generation ◽  
Water Molecules ◽  
Water Interface ◽  
Sum Frequency ◽  
Air Water Interface ◽  
Frequency Generation

<div> <div> <div> <p>The temperature dependence of the vibrational sum-frequency generation (vSFG) spectra of the the air/water interface is investigated using many-body molecular dynamics (MB-MD) simulations performed with the MB-pol potential energy function. The total vSFG spectra calculated for different polarization combinations are then analyzed in terms of molecular auto-correlation and cross-correlation contributions. To provide molecular-level insights into interfacial hydrogen-bonding topologies, which give rise to specific spectroscopic features, the vSFG spectra are further investigated by separating contributions associated with water molecules donating 0, 1, or 2 hydrogen bonds to neighboring water molecules. This analysis suggests that the low frequency shoulder of the free OH peak which appears at ∼3600 cm−1 is primarily due to intermolecular couplings between both singly and doubly hydrogen-bonded molecules. </p> </div> </div> </div>

The Design of Borehole-Surface Networked Oil-Water Interface Resistivity Imager Receiver

2013 ◽  
Vol 333-335 ◽  
pp. 374-378
Author(s):  
Han Sun ◽  
Zhen Feng Li ◽  
Bing Han
Keyword(s):  
Low Frequency ◽  
Main Function ◽  
Water Interface ◽  
Signal Conditioning ◽  
Frequency Signal ◽  
Principle Calculation ◽  
System Error ◽  
Oil Water ◽  
Borehole Surface

The borehole-surface networked oil-water interface resistivity imager receiver which is in-depth research and designed in the thesis bases on the borehole-surface resestivity method.The text recommended a few hardware and the software constitution of module. The main function of every module is set forth in detail.These include the kind of system error and its calibration and principle calculation,the best way to weak low frequency signal conditioning,synchronization technique that the system applied.

scholarly journals Effects of pulsed low frequency electromagnetic fields on water using photoluminescence spectroscopy: Role of bubble/water interface

2005 ◽  
Vol 122 (11) ◽  
pp. 114513 ◽  
Author(s):  
Philippe Vallée ◽  
Jacques Lafait ◽  
Pascale Mentré ◽  
Marie-Odile Monod ◽  
Yolène Thomas
Keyword(s):  
Electromagnetic Fields ◽  
Low Frequency ◽  
Photoluminescence Spectroscopy ◽  
Water Interface

scholarly journals “On-The-Fly” Calculation of the Vibrational Sum-Frequency Generation Spectrum at the Air-Water Interface

Molecules ◽  
2020 ◽  
Vol 25 (17) ◽  
pp. 3939 ◽  
Author(s):  
Deepak Ojha ◽  
Thomas D. Kühne
Keyword(s):  
Low Frequency ◽  
Sum Frequency Generation ◽  
Water Interface ◽  
Wannier Functions ◽  
Sum Frequency ◽  
Generation Spectrum ◽  
Air Water Interface ◽  
Bond Stretching ◽  
Frequency Generation

In the present work, we provide an electronic structure based method for the “on-the-fly” determination of vibrational sum frequency generation (v-SFG) spectra. The predictive power of this scheme is demonstrated at the air-water interface. While the instantaneous fluctuations in dipole moment are obtained using the maximally localized Wannier functions, the fluctuations in polarizability are approximated to be proportional to the second moment of Wannier functions. The spectrum henceforth obtained captures the signatures of hydrogen bond stretching, bending, as well as low-frequency librational modes.

Temperature Dependence of the Air/Water Interface Revealed by Polarization Sensitive Sum-Frequency Generation Spectroscopy

2018 ◽  
Author(s):  
Daniel R. Moberg ◽  
Shelby C. Straight ◽  
Francesco Paesani
Keyword(s):  
Temperature Dependence ◽  
Low Frequency ◽  
Potential Energy Function ◽  
Md Simulations ◽  
Sum Frequency Generation ◽  
Water Molecules ◽  
Water Interface ◽  
Sum Frequency ◽  
Air Water Interface ◽  
Frequency Generation

<div> <div> <div> <p>The temperature dependence of the vibrational sum-frequency generation (vSFG) spectra of the the air/water interface is investigated using many-body molecular dynamics (MB-MD) simulations performed with the MB-pol potential energy function. The total vSFG spectra calculated for different polarization combinations are then analyzed in terms of molecular auto-correlation and cross-correlation contributions. To provide molecular-level insights into interfacial hydrogen-bonding topologies, which give rise to specific spectroscopic features, the vSFG spectra are further investigated by separating contributions associated with water molecules donating 0, 1, or 2 hydrogen bonds to neighboring water molecules. This analysis suggests that the low frequency shoulder of the free OH peak which appears at ∼3600 cm−1 is primarily due to intermolecular couplings between both singly and doubly hydrogen-bonded molecules. </p> </div> </div> </div>

Numerical investigation of transmission of low frequency sound through a smooth air-water interface

2015 ◽  
Vol 14 (3) ◽  
pp. 334-342 ◽  
Author(s):  
Parviz Ghadimi ◽  
Alireza Bolghasi ◽  
Mohammad A. Feizi Chekab ◽  
Rahim Zamanian
Keyword(s):  
Numerical Investigation ◽  
Low Frequency ◽  
Water Interface ◽  
Frequency Sound ◽  
Air Water Interface

scholarly journals “On-the-fly” calculation of the Vibrational Sum-frequency Generation Spectrum at the Air-water Interface

2020 ◽  
Author(s):  
Deepak Ojha ◽  
Thomas Kühne
Keyword(s):  
Predictive Power ◽  
Low Frequency ◽  
Sum Frequency Generation ◽  
Water Interface ◽  
Wannier Functions ◽  
Sum Frequency ◽  
Generation Spectrum ◽  
Air Water Interface ◽  
Bond Stretching ◽  
Frequency Generation

In the present work, we provide an electronic structure based method for the &ldquo;on-the-fly&rdquo; deter- mination of vibrational sum frequency generation (v-SFG) spectra. The predictive power of this scheme is demonstrated at the air-water interface. While the instantaneous fluctuations in dipole moment are obtained using the maximally localized Wannier functions, the fluctuations in polar- izability are approximated to be proportional to the second moment of Wannier functions. The spectrum henceforth obtained captures the signatures of hydrogen bond stretching, bending, as well as low-frequency librational modes.

A Study on the Fine Structure of the Lateral Line Organ of the Sea Eel

1973 ◽  
Vol 31 ◽  
pp. 648-649
Author(s):  
K. Hama
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Lateral Line ◽  
Low Frequency ◽  
Sensory Cells ◽  
Apical Surface ◽  
Voltage Electron ◽  
Sensory Epithelia ◽  
Low Frequency Vibration ◽  
Transmission Electron

The lateral line organs of the sea eel consist of canal and pit organs which are different in function. The former is a low frequency vibration detector whereas the latter functions as an ion receptor as well as a mechano receptor.The fine structure of the sensory epithelia of both organs were studied by means of ordinary transmission electron microscope, high voltage electron microscope and of surface scanning electron microscope.The sensory cells of the canal organ are polarized in front-caudal direction and those of the pit organ are polarized in dorso-ventral direction. The sensory epithelia of both organs have thinner surface coats compared to the surrounding ordinary epithelial cells, which have very thick fuzzy coatings on the apical surface.

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