Inter-scale Energy Transfer in a Multi-scale Flow

2019 ◽  
pp. 3-8
Author(s):  
O. R. H. Buxton ◽  
P. Baj
Keyword(s):  
Energy Transfer ◽  
Multi Scale

Excited-state localization and energy transfer in pyrene core dendrimers with fluorene/carbazole as the dendrons and acetylene as the linkages

2016 ◽  
Vol 18 (5) ◽  
pp. 4134-4143 ◽  
Author(s):  
Linyin Yan ◽  
Yan Wan ◽  
Andong Xia ◽  
Sheng Hien Lin ◽  
Ran Huang
Keyword(s):  
Energy Transfer ◽  
Excited State ◽  
Theoretical Model ◽  
Empirical Methods ◽  
Multi Scale ◽  
Td Dft ◽  
Semi Empirical

Multi-scale theoretical model and spectra simulation for dendrimers combining TD-DFT/DFT and semi-empirical methods.

Comparison of Passive and Active Energy Pumping in Mechanical Nonlinear System

2005 ◽  
Author(s):  
Andrey I. Musienko ◽  
Leonid I. Manevitch
Keyword(s):  
Energy Transfer ◽  
Control Algorithm ◽  
Passive Control ◽  
Homogeneous System ◽  
Multi Scale ◽  
External Perturbations ◽  
Energy Pumping ◽  
Wide Range ◽  
Resonant Mechanism ◽  
Small Consumption

We describe nonlinear dynamics of essentially non-homogeneous system of coupled oscillators using the technique of multi-scale expansions. The resonant mechanism of passive energy transfer from a massive oscillator into a light auxiliary one provides essential reduction of energy of the massive oscillator. Proposed active control algorithm increases noticeably the efficiency of energy transfer in comparison with passive control. The important advantage of this algorithm is that it provides a small consumption of energy. It is expedient to use our algorithm in the certain limits of parameters determined in the paper. This algorithm provides a necessary level of reduction of oscillator amplitude in a wide range of external perturbations.

Multi-Scale Analysis of Energy Transfer in Scalar Turbulence

2005 ◽  
Vol 22 (11) ◽  
pp. 2877-2880 ◽  
Author(s):  
Fang Le ◽  
Cui Gui-Xiang ◽  
Xu Chun-Xiao ◽  
Zhang Zhao-Shun
Keyword(s):  
Energy Transfer ◽  
Scale Analysis ◽  
Multi Scale ◽  
Scalar Turbulence ◽  
Multi Scale Analysis

scholarly journals Engineering of Ultrafast High Efficiency Light-Harvesters

2020 ◽  
Author(s):  
Andreas Albrecht ◽  
Julia Nowak ◽  
Peter Walla
Keyword(s):  
Energy Transfer ◽  
High Efficiency ◽  
Light Harvesting ◽  
Solar Spectrum ◽  
Energy Conversion Efficiency ◽  
Absorption And Emission ◽  
Multi Scale ◽  
Oriented Molecules ◽  
First Results ◽  
Spectral Ranges

Nature provides evidence that there is no fundamental limit for harvesting and funneling nearly all scattered sun-photons onto smaller conversion centers by ultra-fast emergy transfer processes. Recently, a proof-of-principle study showed that this can also be achieved by artificial systems containing light-harvesting pools of randomly oriented molecules that funnel energy to individual, aligned light-redirecting molecules.<br>However, capturing the entire solar spectrum requires engineering of complex multi-element structures considering macroscopic refraction and wave guiding of different spectral ranges of multijunction photovoltaics as well as ultrafast, nanoscopic light-harvesting, energy transfer and funneling, anisotropic absorption and emission and the spectra of a multitude of pigments of different orientations and concentrations. So far, no tool excited that allowed model such structures in one system.<br>Here we present a ray tracing tool allowing to model and analyze such multi-scale structures, including molecular, ultrafast energy transfer and funneling as well as anisotropic absorption and emission as well as micro-and macroscopic waveguiding and raytracing in one tool. We present first results of solar concentrator architectures with the highest theoretical energy conversion efficiency reported so far.<br>A novel tool is provided that allows to construct, model and analyze any desired complex ultrafast light-harvesting/photovoltaic architecture with the highest efficiencies by considering molecular, nanometric energy transfer and funneling as well as microscopic waveguiding and raytracing.

scholarly journals Engineering of Ultrafast High Efficiency Light-Harvesters

2020 ◽  
Author(s):  
Andreas Albrecht ◽  
Julia Nowak ◽  
Peter Walla
Keyword(s):  
Energy Transfer ◽  
High Efficiency ◽  
Light Harvesting ◽  
Solar Spectrum ◽  
Energy Conversion Efficiency ◽  
Absorption And Emission ◽  
Multi Scale ◽  
Oriented Molecules ◽  
First Results ◽  
Spectral Ranges

Nature provides evidence that there is no fundamental limit for harvesting and funneling nearly all scattered sun-photons onto smaller conversion centers by ultra-fast emergy transfer processes. Recently, a proof-of-principle study showed that this can also be achieved by artificial systems containing light-harvesting pools of randomly oriented molecules that funnel energy to individual, aligned light-redirecting molecules.<br>However, capturing the entire solar spectrum requires engineering of complex multi-element structures considering macroscopic refraction and wave guiding of different spectral ranges of multijunction photovoltaics as well as ultrafast, nanoscopic light-harvesting, energy transfer and funneling, anisotropic absorption and emission and the spectra of a multitude of pigments of different orientations and concentrations. So far, no tool excited that allowed model such structures in one system.<br>Here we present a ray tracing tool allowing to model and analyze such multi-scale structures, including molecular, ultrafast energy transfer and funneling as well as anisotropic absorption and emission as well as micro-and macroscopic waveguiding and raytracing in one tool. We present first results of solar concentrator architectures with the highest theoretical energy conversion efficiency reported so far.<br>A novel tool is provided that allows to construct, model and analyze any desired complex ultrafast light-harvesting/photovoltaic architecture with the highest efficiencies by considering molecular, nanometric energy transfer and funneling as well as microscopic waveguiding and raytracing.

A quantitative approach to inner shell losses

1978 ◽  
Vol 36 (1) ◽  
pp. 526-527 ◽  
Author(s):  
R.D. Leapman ◽  
P. Rez ◽  
D.F. Mayers
Keyword(s):  
Energy Transfer ◽  
Cross Section ◽  
Cross Sections ◽  
Accurate Determination ◽  
Background Intensity ◽  
Core Excitation ◽  
Quantitative Basis ◽  
Cross Section Differential ◽  
Bound Electrons

Microanalysis by EELS has been developing rapidly and though the general form of the spectrum is now understood there is a need to put the technique on a more quantitative basis (1,2). Certain aspects important for microanalysis include: (i) accurate determination of the partial cross sections, σx(α,ΔE) for core excitation when scattering lies inside collection angle a and energy range ΔE above the edge, (ii) behavior of the background intensity due to excitation of less strongly bound electrons, necessary for extrapolation beneath the signal of interest, (iii) departures from the simple hydrogenic K-edge seen in L and M losses, effecting σx and complicating microanalysis. Such problems might be approached empirically but here we describe how computation can elucidate the spectrum shape.The inelastic cross section differential with respect to energy transfer E and momentum transfer q for electrons of energy E0 and velocity v can be written as

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