Dipole-dipole and exchange energy transfer in different types of porphyrin chemical dimers

1995 ◽  
Vol 107 (6) ◽  
pp. 795-802
Author(s):  
E Zenkevich ◽  
A Shul’ga ◽  
A Chernook ◽  
E Sagun ◽  
G Gurinovich
Keyword(s):  
Energy Transfer ◽  
Exchange Energy ◽  
Different Types ◽  
Chemical Dimers

Lumineszenzuntersuchungen zum Problem der Energieübertragung in organischen Molekülkristallen

1970 ◽  
Vol 25 (6) ◽  
pp. 955-966 ◽  
Author(s):  
F. Belitz
Keyword(s):  
Energy Transfer ◽  
Single Crystals ◽  
Fluorescence Spectra ◽  
Dipole Interaction ◽  
Main Process ◽  
Transfer Processes ◽  
Decay Times ◽  
Different Types ◽  
The Mean ◽  
Host Lattices

Abstract From fluorescence spectra and decay times of single crystals of 2.3-dimethylnaphthalene, phenanthrene and p-terphenyl doped with one or two different types of fluorescence molecules (anthracene and, or tetracene) informations about the energy transfer processes are obtained. For doping concentrations smaller than 4·10-4 Mol/Mol the transfer by excitons is the main process. The dipole-dipole interaction over distances more than 80 Å (14 mean molecular distances) can be excluded. The mean travelling distance of the excitons in the three host lattices was found to be 250 - 300 mean molecular distances.

An Investigation on Real and Imaginary Energy Transfer Mechanism Caused in Rotating Flow Passage of Centrifugal Pump

2005 ◽  
Author(s):  
Takaharu Tanaka ◽  
Chao Liu
Keyword(s):  
Energy Transfer ◽  
Physical Properties ◽  
Centrifugal Pump ◽  
Rotational Motion ◽  
Rotating Flow ◽  
Physical Parameters ◽  
Energy Transfer Mechanism ◽  
Flow Passage ◽  
Different Types ◽  
Force Velocity

Hydraulic energy is constructed from real and imaginary energies. Their acting directions are normal to each other. Their physical properties are quite different. All the physical parameters, such as force, velocity, and acceleration therefore consist of two different type real and imaginary functions. Physically, there are three different types of fluid particles rotational motion: straightly forward non-rotational motion, which is based upon kinetic real physical parameters, circularly forward rotational motion, which is based upon un-kinetic imaginary physical parameters, and their combined rotational motion. Their interrelation is shown in diagram.

Modeling and Optimum Design of a Wire Mesh Solar Volumetric Air Receiver

1997 ◽  
Vol 119 (3) ◽  
pp. 208-213 ◽  
Author(s):  
T. E. Hellmuth ◽  
L. K. Matthews
Keyword(s):  
Energy Transfer ◽  
Optimum Design ◽  
Air Temperature ◽  
Wire Mesh ◽  
Transfer Processes ◽  
Model Predictions ◽  
Different Types ◽  
And Performance ◽  
Performance Results ◽  
Discrete Layer

This paper describes the development of a computer model to predict the performance of a discrete layer wire mesh solar volumetric air receiver. The model accounts for all important energy transfer processes within the absorber and allows for the use of two different types of wire mesh screens. Model predictions are compared to experimental results for validation purposes. An optimum design analysis is performed to determine optimum receiver characteristics and performance. Results show a predicted efficiency in the range of 89 percent to 87 percent when the outlet air temperature is between 700°C and 820°C, respectively.

scholarly journals Isolation and spectral characterization of phycobiliproteins

1970 ◽  
Vol 116 (2) ◽  
pp. 161-169 ◽  
Author(s):  
F. W. J. Teale ◽  
R. E. Dale
Keyword(s):  
Energy Transfer ◽  
Ionic Strength ◽  
Aqueous Medium ◽  
Fluorescence Emission ◽  
Protein Subunit ◽  
Fluorescence Excitation ◽  
Different Types ◽  
Single Protein ◽  
Polarization Spectra

Several phycobiliproteins were prepared chromatographically pure and their absorption, fluorescence-emission, fluorescence-excitation and fluorescence-excitation polarization spectra determined. Changes in these spectra with ionic strength of the aqueous medium and chromoprotein concentration were interpreted in terms of interchromophore energy transfer and protein subunit equilibria. The complexity of the polarization spectra confirms the presence of different types of chromophore, designated sensitizing (‘s’) and fluorescing (‘f’), in a single protein.

A Distinction Between Different Types of Stall in a Centrifugal Compressor Stage

1986 ◽  
Vol 108 (1) ◽  
pp. 83-92 ◽  
Author(s):  
N. Ka¨mmer ◽  
M. Rautenberg
Keyword(s):  
Energy Transfer ◽  
Centrifugal Compressor ◽  
High Frequency ◽  
Low Frequency ◽  
Rotating Stall ◽  
Compressor Stage ◽  
Vaneless Diffuser ◽  
Pressure Transducers ◽  
Different Types ◽  
Probe Measurements

The flow at the stall line of a centrifugal compressor with vaneless diffuser was investigated at different speeds. A distinction between three kinds of stall phenomena could be made. One type of stall with regurgitation of fluid at the impeller inlet was of a nonperiodic character, whereas two different types of periodic stall appeared at higher speeds. The rotating nature of these two types of stall was verified from a comparison of signals of peripherally spaced pressure transducers. The low-frequency rotating stall exhibited features of diffuser generated stall and a lobe number of three was measured. From a detailed investigation of the high-frequency rotating stall, which included unsteady probe measurements upstream and downstream of the impeller, it can be shown that this type of rotating stall is generated in the impeller by a periodic breakdown of energy transfer from the rotor to the flow. This conclusion is supported by the distribution of shroud static pressures.

scholarly journals Chaotic-Like Transfers of Energy in Hamiltonian PDEs

2021 ◽  
Author(s):  
Filippo Giuliani ◽  
Marcel Guardia ◽  
Pau Martin ◽  
Stefano Pasquali
Keyword(s):  
Normal Form ◽  
Time Scales ◽  
Symbolic Dynamics ◽  
Exchange Energy ◽  
Birkhoff Normal Form ◽  
Smale Horseshoe ◽  
Beam Equations ◽  
Different Types ◽  
Hamiltonian Pdes

AbstractWe consider the nonlinear cubic Wave, the Hartree and the nonlinear cubic Beam equations on $${\mathbb {T}}^2$$ T 2 and we prove the existence of different types of solutions which exchange energy between Fourier modes in certain time scales. This exchange can be considered “chaotic-like” since either the choice of activated modes or the time spent in each transfer can be chosen randomly. The key point of the construction of those orbits is the existence of heteroclinic connections between invariant objects and the construction of symbolic dynamics (a Smale horseshoe) for the Birkhoff Normal Form truncation of those equations.

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