On the selection of loads in the multiload method for measuring the acoustic source parameters of duct systems

2002 ◽  
Vol 111 (3) ◽  
pp. 1171-1176 ◽  
Author(s):  
Seung-Ho Jang ◽  
Jeong-Guon Ih
Keyword(s):  
Source Parameters ◽  
Acoustic Source ◽  
Duct Systems ◽  
Selection Of

Source parameters for the numerical simulation of lightning as a nonlinear acoustic source

2014 ◽  
Vol 136 (4) ◽  
pp. 2223-2223
Author(s):  
Andrew Marshall ◽  
Neal Evans ◽  
Chris Hackert ◽  
Karl Oelschlaeger
Keyword(s):  
Numerical Simulation ◽  
Source Parameters ◽  
Acoustic Source ◽  
Nonlinear Acoustic

scholarly journals Review of Acoustic Sources Alternatives to a Dodecahedron Speaker

2019 ◽  
Vol 9 (18) ◽  
pp. 3705 ◽  
Author(s):  
Nikolaos M. Papadakis ◽  
Georgios E. Stavroulakis
Keyword(s):  
High Frequency ◽  
Sound Pressure ◽  
Transfer Functions ◽  
Acoustic Measurements ◽  
Acoustic Source ◽  
Acoustic Characteristics ◽  
Acoustic Sources ◽  
Future Work ◽  
Selection Of ◽  
Better Than

An omnidirectional source is required in many acoustic measurements. Commonly a dodecahedron speaker is used but due to various factors (e.g., high cost, transportation difficulties) other acoustic sources are sometimes preferred. In this review, fifteen acoustic source alternatives to a dodecahedron speaker are presented while emphasis is placed on features such as omnidirectionality, repeatability, adequate sound pressure levels, even frequency response, accuracy in measurement of acoustic parameters and fulfillment of ISO 3382-1 source requirements. Some of the alternative acoustic sources have the appropriate features to provide usable results for acoustic measurements, some have acoustic characteristics better than a dodecahedron speaker (e.g., omnidirectionality in the high-frequency range), while some can potentially fulfill the ISO 3382-1 source requirements. Collected data from this review can be used in many areas (e.g., ISO measurements, head-related transfer functions measurements) for the appropriate selection of an acoustic source according to the expected use. Finally, suggestions for uses and future work are given aimed at achieving further advances in this field.

Spectral seismograms, magnitude spectra and source parameters of a selection of Indian plate earthquakes

2000 ◽  
Vol 30 (4) ◽  
pp. 423-438 ◽  
Author(s):  
D. Sarkar ◽  
M.Ravi Kumar ◽  
S.J. Duda ◽  
H.K. Gupta
Keyword(s):  
Source Parameters ◽  
Indian Plate ◽  
Selection Of

scholarly journals Quantifying undesired parallel components in Thévenin-equivalent acoustic source parameters

2018 ◽  
Vol 143 (3) ◽  
pp. 1491-1503 ◽  
Author(s):  
Kren Rahbek Nørgaard ◽  
Stephen T. Neely ◽  
Daniel M. Rasetshwane
Keyword(s):  
Source Parameters ◽  
Acoustic Source ◽  
Thevenin Equivalent

Cognitive gadgets and cognitive priors

2019 ◽  
Vol 42 ◽  
Author(s):  
Gian Domenico Iannetti ◽  
Giorgio Vallortigara
Keyword(s):  
Cognitive Neuroscience ◽  
Selection Of

Abstract Some of the foundations of Heyes’ radical reasoning seem to be based on a fractional selection of available evidence. Using an ethological perspective, we argue against Heyes’ rapid dismissal of innate cognitive instincts. Heyes’ use of fMRI studies of literacy to claim that culture assembles pieces of mental technology seems an example of incorrect reverse inferences and overlap theories pervasive in cognitive neuroscience.

Note on Selection of Coordinate Systems for Geodynamics

1975 ◽  
Vol 26 ◽  
pp. 395-407
Author(s):  
S. Henriksen
Keyword(s):  
Sea Level ◽  
The Other ◽  
Coordinate Systems ◽  
Mean Sea Level ◽  
The Earth ◽  
The One ◽  
Static Systems ◽  
Selection Of

The first question to be answered, in seeking coordinate systems for geodynamics, is: what is geodynamics? The answer is, of course, that geodynamics is that part of geophysics which is concerned with movements of the Earth, as opposed to geostatics which is the physics of the stationary Earth. But as far as we know, there is no stationary Earth – epur sic monere. So geodynamics is actually coextensive with geophysics, and coordinate systems suitable for the one should be suitable for the other. At the present time, there are not many coordinate systems, if any, that can be identified with a static Earth. Certainly the only coordinate of aeronomic (atmospheric) interest is the height, and this is usually either as geodynamic height or as pressure. In oceanology, the most important coordinate is depth, and this, like heights in the atmosphere, is expressed as metric depth from mean sea level, as geodynamic depth, or as pressure. Only for the earth do we find “static” systems in use, ana even here there is real question as to whether the systems are dynamic or static. So it would seem that our answer to the question, of what kind, of coordinate systems are we seeking, must be that we are looking for the same systems as are used in geophysics, and these systems are dynamic in nature already – that is, their definition involvestime.

Sign in / Sign up

Export Citation Format

Share Document