Searching for metals in the 1980s

Earle, Steven

doi:10.1111/j.1365-2451.1985.tb00331.x

Cited by 6 publications

(7 citation statements)

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“…[55] for the Sun, and from refs. [57,[63][64][65] for the Earth. The Sun and Earth radii are R ≈ 6.96 × 10 10 cm and R ⊕ ≈ 6.371 × 10 8 cm, respectively.…”

Section: Density Chemical Composition and Temperature Profiles Of The...mentioning

confidence: 99%

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Dark matter, destroyer of worlds: neutrino, thermal, and existential signatures from black holes in the Sun and Earth

Acevedo

Bramante

Goodman

et al. 2021

J. Cosmol. Astropart. Phys.

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Dark matter can be captured by celestial objects and accumulate at their centers, forming a core of dark matter that can collapse to a small black hole, provided that the annihilation rate is small or zero. If the nascent black hole is big enough, it will grow to consume the star or planet. We calculate the rate of dark matter accumulation in the Sun and Earth, and use their continued existence to place novel constraints on high mass asymmetric dark matter interactions. We also identify and detail less destructive signatures: a newly-formed black hole can be small enough to evaporate via Hawking radiation, resulting in an anomalous heat flow emanating from Earth, or in a flux of high-energy neutrinos from the Sun observable at IceCube. The latter signature is entirely new, and we find that it may cover large regions of parameter space that are not probed by any other method.

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“…[55] for the Sun, and from refs. [57,[63][64][65] for the Earth. The Sun and Earth radii are R ≈ 6.96 × 10 10 cm and R ⊕ ≈ 6.371 × 10 8 cm, respectively.…”

Section: Density Chemical Composition and Temperature Profiles Of The...mentioning

confidence: 99%

“…[58][59][60][61][62], and a temperature profile comprised of the maximum temperature of refs. [63][64][65] for any given radius. We use the maximum temperature because this will yield conservative bounds.…”

Section: Density Chemical Composition and Temperature Profiles Of The...mentioning

confidence: 99%

Dark matter, destroyer of worlds: neutrino, thermal, and existential signatures from black holes in the Sun and Earth

Acevedo

Bramante

Goodman

et al. 2021

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

“…It is also necessary to determine the planets' temperature profiles. There have been multiple Earth temperature models proposed; there is not strong consensus on the matter [23,42,43]. To be conservative, we take the highest reasonable proposed temperature at all radii to construct a "maximum temperature profile" of the Earth.…”

Section: Elemental Makeupmentioning

confidence: 99%

Terrestrial and martian heat flow limits on dark matter

et al. 2020

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If dark matter is efficiently captured by a planet, energy released in its annihilation can exceed that planet's total heat output. Building on prior work, we treat Earth's composition and dark matter capture in detail and present improved limits on dark matter-nucleon scattering cross sections for dark matter masses ranging from 0.1 to 10 10 GeV. We also extend Earth limits by applying the same treatment to Mars. The scope of dark matter models considered is expanded to include spin-dependent nuclear interactions including isospin-independent, proton only, and neutron only interactions. We find that Earth and Mars heating bounds are alleviated for dark matter s-wave self-annihilation cross sections 10 −37 cm 2 .

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“…Therefore, they are likely to be the unloading deformation caused by the stress redistribution of the slope excavation within a period of 22 days. It is noteworthy that this unloading deformation is smaller in Parts A and B but larger in Parts C and D. This is mainly because Parts A and B had become rock slopes after the excavation, while Parts C and D were still covered by thick soil deposits, so the deformation rate of the latter two is significantly slower than that of the former two (Earle, 2015). At the same time, the smaller deformation in Parts A and B is also partly due to the shotcrete support distributed in areas A and B after excavation.…”

Section: Resultsmentioning

confidence: 99%

Slope deformation detection using subpixel offset tracking and an unsupervised learning technique based on unmanned aerial vehicle photogrammetry data

et al. 2023

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Detecting slope deformation is an important issue in engineering. Timely deformation detection can effectively avoid catastrophic slope failure and ensure the safety of a project and engineering personnel. In this study, deformation detection for a quarry slope is implemented using the integration of subpixel offset tracking (sPOT) and unsupervised change detection algorithms based on unmanned aerial vehicle (UAV) image datasets. The sPOT algorithm is used to give the surface displacement field of the slope with subpixel accuracy, and the unsupervised change detection algorithm yields the ground object reconstruction area of the slope to verify and explain the sPOT result. The integrated analysis method in this paper is highly applicable and only requires a minimum of two UAV datasets as raw data. Combining the advantages of the sPOT and unsupervised change detection algorithms, the proposed method has the ability to detect and analyse slow and rapid slope deformation with good accuracy.

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Searching for metals in the 1980s

Abstract: The past four decades have seen an unprecedented development of metal exploration techniques because as exposed and easily exploitable mineral deposits have been used up, exploration geologists have been forced to find new ways of looking deeper into the crust.

Cited by 6 publications

References 0 publications

Dark matter, destroyer of worlds: neutrino, thermal, and existential signatures from black holes in the Sun and Earth

Dark matter, destroyer of worlds: neutrino, thermal, and existential signatures from black holes in the Sun and Earth

Terrestrial and martian heat flow limits on dark matter

Slope deformation detection using subpixel offset tracking and an unsupervised learning technique based on unmanned aerial vehicle photogrammetry data

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