scholarly journals Effect of external electric field upon charge distribution, energy and dipole moment of selected monosaccharide molecules

2012 ◽  
Vol 04 (05) ◽  
pp. 276-285 ◽  
Author(s):  
Jozef Mazurkiewicz ◽  
Piotr Tomasik
Keyword(s):  
Dipole Moment ◽  
Electric Field ◽  
External Electric Field ◽  
Charge Distribution ◽  
Distribution Energy

Water in an External Electric Field: Comparing Charge Distribution Methods Using ReaxFF Simulations

2021 ◽  
Author(s):  
Jason P. Koski ◽  
Stan G. Moore ◽  
Raymond C. Clay ◽  
Kurt A. O’Hearn ◽  
H. Metin Aktulga ◽  
...  
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Charge Distribution

scholarly journals The Role of Polarizabilities in the Fluorescence Behaviour of 4-cyano-N,N-dimethylaniline

1981 ◽  
Vol 36 (8) ◽  
pp. 868-875 ◽  
Author(s):  
Wolfram Baumann
Keyword(s):  
Dipole Moment ◽  
Electric Field ◽  
External Electric Field ◽  
Ground State ◽  
Permanent Dipole Moment ◽  
Reaction Field

Abstract The effect of an external electric field on the absorption and the double fluorescence of 4-cyano-N,N-dimethylaniline can be understood, taking into account reaction field induced polarizability effects. If a TICT state conformation emits the a-fiuorescence in dioxane, the permanent dipole moment in this state is only slightly larger than in the equilibrium ground state.

3D Numerical Analysis of Joule Heating Effect on Electroosmotic Flow in Microchannels

2006 ◽  
Author(s):  
Reza Monazami ◽  
Shahrzad Yazdi ◽  
Mahmoud A. Salehi
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Charge Distribution ◽  
Cross Section ◽  
Joule Heating ◽  
Electroosmotic Flow ◽  
Three Dimensional ◽  
Micro Channel ◽  
Heating Effect ◽  
Energy Equations

In this paper, a three-dimensional numerical model is developed to analyze the influence of the Joule heating on flow characteristics of an electroosmotic flow through square cross section micro-channels. The governing system of equations consists of three sets of equations: electric potential distribution, flow-field and energy equations. The solution procedure involves three steps. The net charge distribution on the cross section of the micro-channel is computed by solving two-dimensional Poisson-Boltzmann equation using the finite element method. Then, using the computed fluid’s charge distribution, the magnitude of the resulting body force due to interaction of an external electric field with the charged fluid elements is calculated along the micro-channel. Finally, three dimensional coupled Navier-Stokes and energy equations are solved by considering the presence of the electro-kinetic body forces and the volumetric heat generation due to Joule heating for three different external electric field strengths. The results reveal that flow patterns are significantly affected by temperature field distribution caused by Joule heating effect especially for high electric field strength cases.

scholarly journals Elementary quantum mechanics of the neutron with an electric dipole moment

2016 ◽  
Vol 113 (27) ◽  
pp. 7438-7442 ◽  
Author(s):  
Gordon Baym ◽  
D. H. Beck
Keyword(s):  
Dipole Moment ◽  
Electric Field ◽  
External Electric Field ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Time Reversal ◽  
Spin Operator ◽  
Spin Motion ◽  
Expectation Value ◽  
Electric Polarizability

The neutron, in addition to possibly having a permanent electric dipole moment as a consequence of violation of time-reversal invariance, develops an induced electric dipole moment in the presence of an external electric field. We present here a unified nonrelativistic description of these two phenomena, in which the dipole moment operator, D→, is not constrained to lie along the spin operator. Although the expectation value of D→ in the neutron is less than 10−13 of the neutron radius, rn, the expectation value of D→ 2 is of order rn2. We determine the spin motion in external electric and magnetic fields, as used in past and future searches for a permanent dipole moment, and show that the neutron electric polarizability, although entering the neutron energy in an external electric field, does not affect the spin motion. In a simple nonrelativistic model we show that the expectation value of the permanent dipole is, to lowest order, proportional to the product of the time-reversal-violating coupling strength and the electric polarizability of the neutron.

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