English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We are concerned with an inverse problem associated with the fractionalHelmholtz system that arises from the study of viscoacoustics in geophysics andthermoviscous modelling of lossy media. We are particularly interested in thecase that both the medium parameter and the internal source of the waveequation are unknown. Moreover, we consider a general class of source functionswhich can be frequency-dependent. We establish several general uniquenessresults in simultaneously recovering both the medium parameter and the internalsource by the corresponding exterior measurements. In sharp contrast, theseunique determination results are unknown in the local case, which would be ofsignificant importance in thermo- and photo-acoustic tomography.

Determining a fractional Helmholtz system with unknown source and medium parameter