scholarly journals Special energies and special frequencies

1987 ◽  
Vol 108 (4) ◽  
pp. 591-603 ◽  
Author(s):  
M. Endrullis ◽  
H. Englisch
Keyword(s):  
Special Frequencies

Special frequencies and Lifshitz singularities in binary random harmonic chains

1986 ◽  
Vol 45 (3-4) ◽  
pp. 395-417 ◽  
Author(s):  
Th. M. Nieuwenhuizen ◽  
J. M. Luck ◽  
J. Canisius ◽  
J. L. van Hemmen ◽  
W. J. Ventevogel
Keyword(s):  
Special Frequencies ◽  
Random Harmonic Chains ◽  
Lifshitz Singularities

The effect of resonance on the linear sampling method

2016 ◽  
Vol 24 (3) ◽  
Author(s):  
Maysam Haghparast ◽  
Seyyed A. Mirtaheri ◽  
Mohammad S. Abrishamian
Keyword(s):  
Resonance Frequency ◽  
Sampling Method ◽  
Selection Method ◽  
Destructive Effect ◽  
Frequency Selection ◽  
Linear Sampling Method ◽  
Comprehensive Survey ◽  
Special Frequencies ◽  
Linear Sampling

AbstractResonance frequency is examined for its effect on the linear sampling method (LSM). The aim of the study is to present an evaluation of occurrence of anomaly at some special frequencies in the LSM procedure. A comprehensive survey is done to analyze the destructive effect of resonance for LSM analysis. Analytical resonance calculations are used to verify the claim. Finally, a frequency selection method is proposed in order to overcome this phenomenon.

Algebraically special frequencies of NUT black holes

2004 ◽  
Vol 21 (19) ◽  
pp. 4523-4529 ◽  
Author(s):  
Donato Bini ◽  
Christian Cherubini
Keyword(s):  
Black Holes ◽  
Special Frequencies

Structures and Optical Properties of Sm-Doped CuInTe2 Semiconductor

2015 ◽  
Vol 1094 ◽  
pp. 218-221
Author(s):  
Xiao Meng Nie ◽  
Yong Quan Guo
Keyword(s):  
Optical Properties ◽  
Raman Scattering ◽  
Electronic Structures ◽  
Chalcopyrite Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fluctuation Phenomenon ◽  
Before And After ◽  
Semiconducting Compounds ◽  
Special Frequencies

Since the rare earth based compounds have shown excellent properties such as luminescence and photo-electric transformation effect due to their 4f electronic structures. A novel Sm-doped CuIn1-xSmxTe2 semiconducting compounds have been designed and their crystal structures, microstructures and optical properties have been investigated using X-ray diffraction(XRD), scan electron microscopy (SEM), ultraviolet and visible spectrophotometer and Raman scattering. The results reveal that the doping of samarium into CuInTe2 (CIT) could stabilize the chalcopyrite structure, the lattice parameters shows fluctuation phenomenon with doping Sm in CIT. The SEM morphologies show that the grains tend to be agglomeration and form the column-like or the flake-like single crystals. The band gap Eg are corresponding to 1.25eV and 1.32eV before and after doping Sm with 0.1 mole into CuInTe2. Raman scattering analysis proves that Sm significantly adjusts the atomic vibrating models, and result in the losses of some vibrating peaks. It reveals that doping of Sm into CuInTe2 is helpful for the absorption of spectra with special frequencies.

Special frequencies in the optical reflectance spectra of resonant Bragg structures

2006 ◽  
Vol 48 (9) ◽  
pp. 1814-1819 ◽  
Author(s):  
M. M. Voronov ◽  
E. L. Ivchenko ◽  
A. N. Poddubnyĭ ◽  
V. V. Chaldyshev
Keyword(s):  
Reflectance Spectra ◽  
Optical Reflectance ◽  
Bragg Structures ◽  
Special Frequencies

The Phonon Dissipation Mode in Nanofriction

2016 ◽  
Author(s):  
Zaoqi Duan ◽  
Shuang Cai ◽  
Yan Zhang ◽  
Yunfei Chen ◽  
Yun Dong
Keyword(s):  
Simulation Modeling ◽  
Md Simulation ◽  
Influence Factor ◽  
Atomic Scale ◽  
Sliding Velocity ◽  
Graphene Flake ◽  
Active Control Of Friction ◽  
Densities Of States ◽  
The Relationship ◽  
Special Frequencies

The phonon dissipation is investigated through molecular dynamics (MD) simulation modeling graphene flake sliding on supported graphene in this paper. With the help of the advantage of MD, we explore the phonon mode variation of the substrate induced by the behavior of friction in terms of phonon densities of states. Moreover, phonon dissipation modes connected with the relative sliding velocity and the temperature of system are established respectively. The simulation results demonstrate phonon dissipation is represented as special phonon frequencies while those are closely related to the sliding velocities but would not shift as the change of temperatures. For an explanation of the special frequencies, we further simplify the model by directly adding the velocity to the atoms of the flake in the MD model, although it is impractical. It is found that a special frequency of phonon dissipation is generally in agreement with the sliding frequency at low temperature eliminating the interference of temperature in a range of velocities from 50m/s to 250m/s, namely, the velocity is directly related to the modes of phonon dissipation and friction, which is consistent with the previously reported result[1] that the velocity is an influence factor for friction both in experimental and theoretical researches. Therefore, the relationship makes possible the active control of friction. It is the first step toward using this method to reveal the fundamental questions in the study of atomic-scale friction.

Abnormal capacitance–voltage behaviors of bismuth-doped CaCu3Ti4O12 ceramics

2017 ◽  
Vol 31 (20) ◽  
pp. 1750133 ◽  
Author(s):  
Ling Fang Xu ◽  
Kang Sun ◽  
Xing Feng ◽  
Hai Bo Xiao ◽  
Rui Long Wang ◽  
...  
Keyword(s):  
Activation Energy ◽  
Negative Curvature ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Electric Modulus ◽  
Capacitance Voltage ◽  
Solid State Sintering ◽  
Sintering Method ◽  
Bismuth Doping ◽  
Special Frequencies

Ca[Formula: see text]Bi[Formula: see text]Cu3Ti4O[Formula: see text] ([Formula: see text] = 0.0, 0.1, 0.2 and 0.3; BCCTO) ceramics were prepared by traditional solid-state sintering method. All samples had pure cubic perovskite-like structure. A drastic grain size reduction was observed with bismuth doping. Dielectric spectra showed two obvious relaxation steps corresponding to two series of peaks in the imaginary part of electric modulus spectra and dielectric loss spectra too. Activation energy fitting by electric modulus spectra reflected different conducting segments in BCCTO ceramics of grains and oxygen vacancies below room temperature. Normalized capacitance dependent of extra bias showed different voltage–capacitance coefficients at special frequencies that suggested multirelaxation mechanisms related with grain and oxygen vacancy. A positive capacitance curvature implies dipolar relaxations in CCTO grains. Whereas a negative curvature suggests oxygen-related relaxations at the interface.

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