scholarly journals Symmetry of Galactic Structure

2020 ◽  
Author(s):  
Richard Oldani
Keyword(s):  
Energy Flow ◽  
Galactic Structure ◽  
Gravitational Energy ◽  
Material System ◽  
Mass Energy ◽  
Action Integral ◽  
Energy Flows ◽  
Energy Equivalence ◽  
Mass Flows ◽  
Transverse Fields

It is hypothesized that due to mass-energy equivalence there exist transverse fields caused 7 by energy flows that are analogous to gravitomagnetic fields generated by mass flows. 8 Relativistically correct equations describing energy flow are derived by using the action integral of 9 a Lagrangian and assuming that the properties of energy, when described four-dimensionally with 10 time, are independent of the material system which supports them. The equations allow the 11 electromagnetic and gravitational energy flows to be compared revealing an underlying symmetry 12 of galactic structure.

scholarly journals Retraction Note: Mass–Energy Equivalence Extension onto a Superfluid Quantum Vacuum

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Amrit Srečko Šorli
Keyword(s):  
Quantum Vacuum ◽  
Mass Energy ◽  
Link Type ◽  
Energy Equivalence

Editor's Note: this Article has been retracted; the Retraction Note is available at https://doi.org/10.1038/s41598-020-80949-z.

Statistical energy analysis as a tool for quantifying sound and vibration transmission paths

1994 ◽  
Vol 346 (1681) ◽  
pp. 449-464 ◽  
Keyword(s):  
Energy Flow ◽  
Complex Structure ◽  
Linear Equations ◽  
Least Square ◽  
Net Energy ◽  
Sea Temperature ◽  
Energy Flows ◽  
The Difference ◽  
Symmetry Relations ◽  
Loss Factors

When a complex structure is excited in several different ways by different sources, the sea energy balance equations result in a set of linear equations that can be used to calculate loss factors, coupling loss factors or net energy flows and incoming powers. If certain symmetry relations are used, and/or if some prior knowledge about the system is available, the set of linear equations is overdetermined and can be solved by a least square technique. A good indicator for the direction of the energy flow is the SEA temperature of the subsystems. Experiments and computer simulations performed on three plate arrangements gave in general good results when the coupling was weak and there were more than three modes in the frequency band of interest. Not so good results were obtained when a small energy flow has to be measured as the difference of large quantities.

An elementary development of mass–energy equivalence

1983 ◽  
Vol 51 (5) ◽  
pp. 461-462 ◽  
Author(s):  
Daniel J. Steck ◽  
Frank Rioux
Keyword(s):  
Mass Energy ◽  
Energy Equivalence

Diffusion equation modelling for energy flow analysis in reverberation chambers

2021 ◽  
Vol 263 (1) ◽  
pp. 5637-5642
Author(s):  
Ryan Hao ◽  
Ning Xiang
Keyword(s):  
Diffusion Equation ◽  
Energy Flow ◽  
Flow Analysis ◽  
Equation Model ◽  
Computationally Efficient ◽  
Reverberation Chamber ◽  
Sound Fields ◽  
Energy Flows ◽  
Standardized Measurement ◽  
Reverberation Chambers

Noise is a growing concern in the built environment. Sound absorbers are a viable option for noise treatment. However, the characterization of their absorption coefficient in standardized measurement chambers still show challenges for high accuracy as required in practice. In recent years, experimental analysis has shown that assumptions of diffuse sound fields made in well-known reverberation chambers are unfulfilled. Specifically, that sound intensities in chamber-based measurement methods are presumed to be isotropic or diffuse. Diffusion equation models have shown dramatic changes in energy flow in the presence of highly absorptive materials under test. This has been attributed to well-documented inconsistencies reported from reverberation chamber measurements across different laboratories. This work will demonstrate that the diffusion equation model is proving to be a computationally efficient and viable method for predicting sound energy flows, garnering an increasing amount of interest from the acoustical community.

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