scholarly journals A New Mass Flux Correction Procedure for Vertically Integrated Energy Transport by Constraining Mass, Energy, and Water Budgets

2020 ◽  
Vol 47 (22) ◽  
Author(s):  
H. K. Bangalath ◽  
O. M. Pauluis
Keyword(s):  
Mass Flux ◽  
Energy Transport ◽  
Correction Procedure ◽  
Mass Energy ◽  
Flux Correction ◽  
Water Budgets

scholarly journals Elimination of numerical dispersion in finite‐difference modeling and migration by flux‐corrected transport

Geophysics ◽  
1995 ◽  
Vol 60 (6) ◽  
pp. 1830-1842 ◽  
Author(s):  
Tong Fei ◽  
Ken Larner
Keyword(s):  
Finite Difference ◽  
Numerical Dispersion ◽  
Correction Procedure ◽  
Reverse Time ◽  
Flux Correction ◽  
Finite Difference Approximations ◽  
Difference Approximations ◽  
Flux Corrected Transport ◽  
Wavefield Continuation ◽  
And Migration

Finite‐difference acoustic‐wave modeling and reverse‐time depth migration based on the full wave equation are general approaches that can take into account arbitrary variations in velocity and density and can handle turning waves as well. However, conventional finite‐difference methods for solving the acoustic‐ or elastic‐wave equation suffer from numerical dispersion when too few samples per wavelength are used. The flux‐corrected transport (FCT) algorithm, adapted from hydrodynamics, reduces the numerical dispersion in finite‐difference wavefield continuation. The flux‐correction procedure endeavors to incorporate diffusion into the wavefield continuation process only where needed to suppress the numerical dispersion. Incorporating the flux‐correction procedure in conventional finite‐difference modeling or reverse‐time migration can provide finite‐difference solutions with no numerical dispersion even for impulsive sources. The FCT correction, which can be applied to finite‐difference approximations of any order in space and time, is an efficient alternative to use for finite‐difference approximations of increasing order. Through demonstrations of modeling and migration on both synthetic and field data, we show the benefits of the FCT algorithm, as well as its inability to fully recover resolution lost when the spatial sampling becomes too coarse.

Energy, transport, and consumption in the Industrial Revolution

2019 ◽  
Vol 42 ◽  
Author(s):  
Joseph A. Tainter ◽  
Temis G. Taylor
Keyword(s):  
Mass Production ◽  
Industrial Revolution ◽  
Energy Transport ◽  
Underlying Assumption

Abstract We question Baumard's underlying assumption that humans have a propensity to innovate. Affordable transportation and energy underpinned the Industrial Revolution, making mass production/consumption possible. Although we cannot accept Baumard's thesis on the Industrial Revolution, it may help explain why complexity and innovation increase rapidly in the context of abundant energy.

Lateral resolution of the electron microbeam analysis

1978 ◽  
Vol 36 (1) ◽  
pp. 542-543
Author(s):  
H.J. Dudek
Keyword(s):  
Quantitative Analysis ◽  
Depth Resolution ◽  
Lateral Resolution ◽  
Cylindrical Particle ◽  
Correction Procedure ◽  
X Ray ◽  
Element Concentrations ◽  
Microbeam Analysis ◽  
The Matrix

The chemical inhomogenities in modern materials such as fibers, phases and inclusions, often have diameters in the region of one micrometer. Using electron microbeam analysis for the determination of the element concentrations one has to know the smallest possible diameter of such regions for a given accuracy of the quantitative analysis.In th is paper the correction procedure for the quantitative electron microbeam analysis is extended to a spacial problem to determine the smallest possible measurements of a cylindrical particle P of high D (depth resolution) and diameter L (lateral resolution) embeded in a matrix M and which has to be analysed quantitative with the accuracy q. The mathematical accounts lead to the following form of the characteristic x-ray intens ity of the element i of a particle P embeded in the matrix M in relation to the intensity of a standard S

Bence-albee after 25 years: A new superior α-factor correction procedure for the quantitative analysis of oxides and silicates

1992 ◽  
Vol 50 (2) ◽  
pp. 1744-1745
Author(s):  
John T. Armstrong
Keyword(s):  
Quantitative Analysis ◽  
Electron Microprobe ◽  
Binary Systems ◽  
Correction Procedure ◽  
Geological Samples ◽  
The Past ◽  
Large Matrix ◽  
Computational Speed ◽  
Microprobe Data ◽  
Geological Sciences

One of the most cited papers in the geological sciences has been that of Albee and Bence on the use of empirical " α -factors" to correct quantitative electron microprobe data. During the past 25 years this method has remained the most commonly used correction for geological samples, despite the facts that few investigators have actually determined empirical α-factors, but instead employ tables of calculated α-factors using one of the conventional "ZAF" correction programs; a number of investigators have shown that the assumption that an α-factor is constant in binary systems where there are large matrix corrections is incorrect (e.g, 2-3); and the procedure’s desirability in terms of program size and computational speed is much less important today because of developments in computing capabilities. The question thus exists whether it is time to honorably retire the Bence-Albee procedure and turn to more modern, robust correction methods. This paper proposes that, although it is perhaps time to retire the original Bence-Albee procedure, it should be replaced by a similar method based on compositiondependent polynomial α-factor expressions.

Flow Boiling at Low Mass Flux

2002 ◽  
Author(s):  
M. E. D. Urso ◽  
V.V. Wadekar ◽  
Geoffrey F. Hewitt
Keyword(s):  
Mass Flux ◽  
Flow Boiling ◽  
Low Mass
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