scholarly journals Electronic heat transport across a molecular wire: Power spectrum of heat fluctuations

2011 ◽  
Vol 84 (19) ◽  
Author(s):  
Fei Zhan ◽  
Sergey Denisov ◽  
Peter Hänggi
Keyword(s):  
Power Spectrum ◽  
Heat Transport ◽  
Molecular Wire ◽  
Electronic Heat

Heat controlling in the mass-graded harmonic lattices with double-well on-site potential

2018 ◽  
Vol 32 (20) ◽  
pp. 1850217
Author(s):  
Peng Kong ◽  
Zhengzheng Wei ◽  
Tao Hu ◽  
Yi Tang
Keyword(s):  
Molecular Dynamics ◽  
Heat Flux ◽  
Power Spectrum ◽  
Molecular Dynamics Simulations ◽  
Heat Transport ◽  
Nonequilibrium Molecular Dynamics ◽  
Thermal Rectification ◽  
Average Temperature ◽  
New Type ◽  
Dynamics Simulations

Using nonequilibrium molecular dynamics simulations, we investigate thermal rectification in mass-graded lattices with a new type on-site potential which has a physical picture of the double-well. By adjusting the ratio of harmonic on-site potential and anharmonic on-site potential, we could obtain the optimal heat transport and the best thermal rectification. In addition, we observe the reversal thermal rectification by changing the ratio of on-site potential and analyzes the mechanism of thermal rectification through the power spectrum. At last, we also study the heat flux and thermal rectification in a different case of average temperature and mass gradient.

scholarly journals Electrons and Phonons in High Temperature Superconductors

2013 ◽  
Vol 2013 ◽  
pp. 1-4
Author(s):  
Anu Singh ◽  
Hempal Singh ◽  
Vinod Ashokan ◽  
B. D. Indu
Keyword(s):  
Heat Capacity ◽  
High Temperature ◽  
Heat Transport ◽  
Function Theory ◽  
High Temperature Superconductors ◽  
Phonon Coupling ◽  
Electronic Heat Capacity ◽  
Electron Phonon Coupling ◽  
Electronic Heat ◽  
Double Time

The defect-induced anharmonic phonon-electron problem in high-temperature superconductors has been investigated with the help of double time thermodynamic electron and phonon Green’s function theory using a comprehensive Hamiltonian which includes the contribution due to unperturbed electrons and phonons, anharmonic phonons, impurities, and interactions of electrons and phonons. This formulation enables one to resolve the problem of electronic heat transport and equilibrium phenomenon in high-temperature superconductors in an amicable way. The problem of electronic heat capacity and electron-phonon problem has been taken up with special reference to the anharmonicity, defect concentration electron-phonon coupling, and temperature dependence.

Femtosecond electronic heat-transport dynamics in thin gold films

1987 ◽  
Vol 59 (17) ◽  
pp. 1962-1965 ◽  
Author(s):  
S. D. Brorson ◽  
J. G. Fujimoto ◽  
E. P. Ippen
Keyword(s):  
Heat Transport ◽  
Gold Films ◽  
Transport Dynamics ◽  
Electronic Heat

scholarly journals Electronic heat transport versus atomic heating in irradiated short metallic nanowires

2019 ◽  
Vol 100 (15) ◽  
Author(s):  
J. Grossi ◽  
J. Kohanoff ◽  
T. N. Todorov ◽  
Emilio Artacho ◽  
E. M. Bringa
Keyword(s):  
Heat Transport ◽  
Metallic Nanowires ◽  
Electronic Heat

scholarly journals Power spectrum of electronic heat current fluctuations

2013 ◽  
Vol 250 (11) ◽  
pp. 2355-2364 ◽  
Author(s):  
Fei Zhan ◽  
Sergey Denisov ◽  
Peter Hänggi
Keyword(s):  
Power Spectrum ◽  
Current Fluctuations ◽  
Heat Current ◽  
Electronic Heat

The on-line use of histogram data for high-speed correction and alignment of electron microscope images

1984 ◽  
Vol 42 ◽  
pp. 556-557
Author(s):  
William Krakow
Keyword(s):  
Power Spectrum ◽  
High Speed ◽  
Direct Memory Access ◽  
Digital Television ◽  
Contrast Transfer Function ◽  
The Past ◽  
High Resolution Tem ◽  
On Line ◽  
Correction Of Astigmatism ◽  
The Fourier Transform

In the past few years on-line digital television frame store devices coupled to computers have been employed to attempt to measure the microscope parameters of defocus and astigmatism. The ultimate goal of such tasks is to fully adjust the operating parameters of the microscope and obtain an optimum image for viewing in terms of its information content. The initial approach to this problem, for high resolution TEM imaging, was to obtain the power spectrum from the Fourier transform of an image, find the contrast transfer function oscillation maxima, and subsequently correct the image. This technique requires a fast computer, a direct memory access device and even an array processor to accomplish these tasks on limited size arrays in a few seconds per image. It is not clear that the power spectrum could be used for more than defocus correction since the correction of astigmatism is a formidable problem of pattern recognition.

Log-log scale roughness spectroscopy of surfaces

1993 ◽  
Vol 51 ◽  
pp. 224-225
Author(s):  
P. Fraundorf ◽  
B. Armbruster
Keyword(s):  
Power Spectrum ◽  
Autocorrelation Function ◽  
Power Spectra ◽  
Scanning Force Microscopy ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Force Microscopy ◽  
Scanning Force ◽  
Lateral Structure ◽  
Scale Roughness

Optical interferometry, confocal light microscopy, stereopair scanning electron microscopy, scanning tunneling microscopy, and scanning force microscopy, can produce topographic images of surfaces on size scales reaching from centimeters to Angstroms. Second moment (height variance) statistics of surface topography can be very helpful in quantifying “visually suggested” differences from one surface to the next. The two most common methods for displaying this information are the Fourier power spectrum and its direct space transform, the autocorrelation function or interferogram. Unfortunately, for a surface exhibiting lateral structure over several orders of magnitude in size, both the power spectrum and the autocorrelation function will find most of the information they contain pressed into the plot’s origin. This suggests that we plot power in units of LOG(frequency)≡-LOG(period), but rather than add this logarithmic constraint as another element of abstraction to the analysis of power spectra, we further recommend a shift in paradigm.

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