F
Friedemann Freund
Researcher at Ames Research Center
Publications - 98
Citations - 3763
Friedemann Freund is an academic researcher from Ames Research Center. The author has contributed to research in topics: Charge carrier & Electric current. The author has an hindex of 31, co-authored 97 publications receiving 3293 citations. Previous affiliations of Friedemann Freund include Arizona State University & Search for extraterrestrial intelligence.
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Mid-infrared emission prior to strong earthquakes analyzed by remote sensing data
TL;DR: Geodyn et al. as discussed by the authors found evidence for correlations between solid Earth processes and atmosphere/ocean dynamics prior to strong earthquakes, selecting examples from 2001 and 2000, finding evidence for a thermal anomaly LST pattern that is apparently related to pre-seismic activity.
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Pre-earthquake signals: Underlying physical processes
TL;DR: In this article, it was shown that most crustal rocks contain dormant electronic charge carriers in the form of peroxy defects, O 3 Si / OO ⧹ SiO 3, known as positive holes.
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Charge Generation and Propagation in Igneous Rocks
TL;DR: In this article, it was shown that when dry gabbro and diorite cores are impacted at relatively low velocities, approximately 100 m/s, highly mobile charge carriers are generated in a small volume near the impact point.
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Electric currents streaming out of stressed igneous rocks - A step towards understanding pre-earthquake low frequency EM emissions
TL;DR: In this paper, it was shown that, when applied stresses to one end of a block of igneous rocks, two currents flow out of the stressed rock volume, i.e., defect electrons on the oxygen anion sublattice, and it flows out through at least 1 m of unstressed rock to meet the electrons that arrive through the outer electric circuit.
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Time-resolved study of charge generation and propagation in igneous rocks
TL;DR: In this paper, the authors used low-to medium-velocity impacts to measure electrical signals with microsecond time resolution, and observed that when gabbro and diorite cores are impacted at relatively low velocities, ≈ 100 m/s, highly mobile charge carriers are generated in a small volume near the impact point.