The role of dispersion and polarization effects in the formation of wood–mineral composite on the base of fine-dispersed components

2018 ◽  
pp. 50-56
Author(s):  
V.E. Danilov ◽  
◽  
V.V. Strokova ◽  
A.M. Ayzenshtadt ◽  
◽  
...  
Keyword(s):  
Polarization Effects

THEORETICAL ASPECTS OF THE POLARIZABILITY OF THE NUCLEON

1993 ◽  
Vol 08 (30) ◽  
pp. 5267-5303 ◽  
Author(s):  
A.I. L’VOV
Keyword(s):  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Gauge Invariance ◽  
Degrees Of Freedom ◽  
Dominant Role ◽  
Energy Shift ◽  
Chiral Perturbation ◽  
Polarization Effects ◽  
Consistent Treatment

Two aspects of the nucleon electromagnetic polarizabilities, αN and βN, are discussed. The first one is the interrelation between static and Compton polarizabilities. Relativistically consistent treatment of the polarization effects based on effective Lagrangians results in the conclusion that the Compton polarizabilities, rather than the static ones, drive the energy shift of the nucleon in external fields. The cluster substructure of the static polarizabilities is shown to be crucial for consistent calculations of the polarizabilities. The second aspect concerns the dominant role of pion degrees of freedom in αN as seen through dispersion relations, chiral perturbation theory, and constituent models. The reported calculations of αN within soliton models are shown to be inconsistent with gauge invariance. The difficulties in explaining the observed large diamagnetic component of βN are emphasized.

Surface structure and polarization effects in GaN Thin Films as studied by Electric Force Microscopy

2000 ◽  
Vol 639 ◽  
Author(s):  
K. M. Jones ◽  
P. Visconti ◽  
F. Yun ◽  
M. A. Reshchikov ◽  
A. A. Baski ◽  
...  
Keyword(s):  
Second Harmonic ◽  
Quantitative Measure ◽  
Electric Force ◽  
Nitride Semiconductors ◽  
Polarization Effects ◽  
Force Microscopy ◽  
Harmonic Term ◽  
Electric Force Microscopy ◽  
Piezoelectric Fields

ABSTRACTStress induced piezoelectric fields in III-nitride semiconductors induce charge at the surface that is comparable to the free carrier concentration intended by doping. These fields, coupled with mixed Ga-polarity and N-polarity within the film, are detrimental to device performance due to an additional scattering caused by a reversal of the electric field normal to the surface. Consequently, investigation of the polarization effects is important and timely as nitride semiconductor devices are being contemplated for system applications. By imaging the surface potential by electric force microscopy (EFM), both a qualitative and a quantitative measure of polarization induced charge distribution across the surface could be obtained. In this vein, we undertook an EFM study in a series of samples. EFM images of as-grown and progressively etched samples not only led to the identification and imaging of inversion domains, but also showed the evolution of different polarities. The polarization of the surface was calculated and was found to agree reasonably well with the values found experimentally. The role of polarization was addressed by extraction of the second harmonic term from EFM signal.

Elastic electron scattering with CH2Br2 and CCl2Br2: The role of the polarization effects

2021 ◽  
Author(s):  
Xiaoli Zhao ◽  
Kedong Wang
Keyword(s):  
Electron Scattering ◽  
Cross Sections ◽  
Substantial Effect ◽  
Elastic Electron ◽  
Elastic Electron Scattering ◽  
Close Coupling ◽  
Polarization Effects ◽  
Impact Energies ◽  
Scattering Cross Sections

Abstract We present elastic electron scattering cross sections with holmethane molecules CH2Br2 and CCl2Br2 in the low energy region ranging from 0.01 to 20 eV. The calculations are performed with R-matrix method in static-exchange plus polarization (SEP) and close-coupling (CC) approximations. The integral, differential, and momentum transfer cross sections are calculated. The convergence of the obtained cross sections is checked at four different levels of SEP approximation. The predicted positions of the resonances agree well with available results. The precise resonance parameters are found to be sensitive to the treatment of polarization effects employed. We found that the polarization has a substantial effect on the cross sections, and this effect becomes even more important for lower impact energies.

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